This article started with a question: is A.J. Green responsible for the biggest proportion of any quarterback's total production? Yes. The answer is yes. 
I took a look at 25 active NFL quarterbacks and broke down all their touchdown passes by receiver. It might make more sense once you see the pie charts.
MORE: Green Bay Leads All-Time Packers-Bears Series for the First Time Since 1932[divider]
1. Drew Brees – 471
If you play fantasy football, you know Drew Brees likes to spread the ball around. Brees has thrown touchdown passes to 58 different players — the second most of any active quarterback.
He and Marques Colston have hooked up for 72 touchdowns since they arrived in New Orleans in 2006 — the second most of any active QB-receiver duo, and the sixth-most ever.[divider]
2. Tom Brady – 464
Tom Brady has thrown at least one touchdown pass to 67 different receivers, the most of any active quarterback by a long shot (Drew Brees is second with 58). [divider]
3. Eli Manning – 324
Of the six active quarterbacks with at least 300 career passing touchdowns, Eli Manning is the only one who hasn't thrown 50 to a single player. Manning, Brees, and Brady are the only active QBs who have thrown double-digit touchdowns to double-digit receivers (ten receivers have caught at least 10 TDs from Manning).[divider]
4. Philip Rivers – 318
Philip Rivers and Antonio Gates are the third most prolific touchdown tandem of all time. Only Peyton Manning/Marvin Harrison (114) and Steve Young/Jerry Rice (92) have been more fruitful.
Gates, Vincent Jackson, and Malcolm Floyd are responsible for 49% of Rivers' career TDs, and Gates is one of five receivers responsible for at least a quarter of his quarterback's career touchdowns.[divider]
5. Aaron Rodgers – 307
Rodgers threw his 300th touchdown pass in Atlanta September 17. It only took him 4,742 attempts to get there, the fewest in history and nearly 600 fewer than Peyton Manning in second place. He has thrown at least 28 TDs in eight of the past nine seasons.
Rodgers has thrown touchdown passes to just 30 different receivers, fewer than Matt Ryan, Jay Cutler, Matt Stafford, and Joe Flacco. None of those quarterbacks has thrown 250 TDs.
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6. Ben Roethlisberger – 304
Le'Veon Bell has only caught five touchdowns from Ben Roethlisberger — somewhat surprising considering he's caught 240 passes overall. The real touchdown guy in Pittsburgh, at least through the air, is Antonio Brown.
The 2010 sixth round pick has 648 catches in his 103-game career. Only five receivers have caught 500+ passes in their first 105 games, and Brown is the only one over 600. [divider]
7. Carson Palmer – 289
Palmer has played for three different NFL teams, and a majority of his TD passes came with his first team — the Cincinnati Bengals. He threw 100 TDs for the Bengals from 2004 to 2010.
He is one of three quarterbacks who has thrown at least 10 touchdowns to Larry Fitzgerald, along with Kurt Warner (39) and Josh McCown (12). [divider]
8. Matt Ryan – 244
Roddy White, Julio Jones, and Tony Gonzalez are responsible for over half of Matt Ryan's career touchdown passes. In fact, they are the only receivers who have caught double-digit TDs from Ryan. [divider]
9. Jay Cutler – 210
Cutler is one of two quarterbacks in the top ten active touchdown pass leaders who has played for three teams. So it shouldn't come as a surprise to see his touchdowns pretty widely distributed. [divider]
10. Matt Stafford – 194
So that Calvin Johnson guy was pretty good huh? When he retired at the end of the 2015 season, he was responsible for 34.4% of Matt Stafford's career touchdown passes. AJ Green has caught the highest percentage of any active QB's TDs — he's responsible for 31.3% of Andy Dalton's TDs. [divider]
11. Joe Flacco – 185
Joe Flacco hasn't thrown a regular season touchdown pass to Torrey Smith since December 28, 2014. Definitely goes to show how much turnover there's been on the Ravens offense since Flacco came aboard in 2008. Smith is the only receiver who has caught at least 20 TDs from Flacco. [divider]
12. Ryan Fitzpatrick – 166
Ever the journeyman, Ryan Fitzpatrick has thrown at least 8 TDs for six different NFL teams — and that number doesn't even include his current team. Brandon Marshall is one of two active receivers responsible for at least 10% of two different quarterbacks' total touchdown passes. He's caught 10.2% of Fitzpatrick's TDs and 19% of Jay Cutler's.[divider]
13. Andy Dalton – 144
No active receiver is responsible for a larger percentage of an active quarterback's passing TDs than AJ Green. Nearly one in three of Andy Dalton's career touchdowns have landed in the waiting hands of the speedy wideout. [divider]
14. Alex Smith – 144
Alex Smith loves to throw to tight ends. Actually, he might just not like to throw to wide receivers, seeing as his top three touchdown receivers are Vernon Davis (TE), Travis Kelce (TE), and Jamaal Charles (RB). Tyreek Hill is looking to change that. He's already caught the sixth most Alex Smith touchdowns — in just 19 games. [divider]
15. Cam Newton – 138
It's crazy to think that Kelvin Benjamin has already caught nearly as many Cam Newton touchdown passes as Steve Smith. It's also crazy to think that Cam Newton has rushed for 48 touchdowns — 18 more than he's thrown to any single receiver. [divider]
16. Russell Wilson – 132
Look at the top TD receivers in Russell Wilson's career. Notice anything? Four of the top seven don't play for the Seahawks anymore. Only Doug Baldwin, Luke Willson, and Jimmy Graham remain on the team. [divider]
16. Andrew Luck – 132
Interesting to see that Andrew Luck and Russell Wilson have the same number of touchdown passes at this point in their careers. Of course, Luck has amassed his 132 touchdown passes in 13 fewer games than Wilson, but still. [divider]
18. Ryan Tannehill – 106
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19. Matt Cassell – 103[divider]
[divider]20. Sam Bradford – 101
It's crazy that Sam Bradford hasn't thrown ten touchdown passes to any one receiver. Jumping around from team to team will do that I suppose. [divider]
21. Derek Carr – 87[divider]
[divider]22. Josh McCown – 82[divider]
[divider]23. Kirk Cousins – 77[divider]
[divider]23. Blake Bortles – 75
Over half of Blake Bortles' touchdowns have been thrown to players named Allen. No other QB on our list has thrown even one TD to a receiver named Allen. #AdvancedStats.[divider]
24. Marcus Mariota – 48
25. Tyrod Taylor – 41
