“The receivers blowing 4 or 5 catchable balls a game still leaves him with a dozen incompletions a game and it would barely tick his percentage over 50%.”
You are very bad at math. Tim Tebow has played in 23 regular season games as a pro. In those 23 games, he has completed 167 passes out of 353 attempts (47.3%). That is an average of 8 incompletions per game.
Now, if you consider 4-5 catchable passes dropped per game, and assume even half (2-3 per game) would’ve been caught by better receivers, then that would have resulted in another 46-58 passes caught, resulting in a completion percentage of 60-63%.
http://www.nfl.com/player/timtebow/497135/gamelogs
Week 19 vs Pats 17 incompletions.
Week 18 vs Steelers 11
Week 17 16
16 again
Only 11 against the Pats in the regular season
19 against Chicago.
Adding 4 or 5 completions to those games really doesn’t help his completion percentage very well. Yeah there’s a few games where it would have a dramatic effect, week 13 vs Minn where he went 10 of 15, week 10 vs KC 2 of 8. But there are more games like week 8 vs Detroit where he went 18 of 39 where a “gift” of 4 or 5 still leaves him with a lousy performance. And it’s probable that in those games with few receptions the receivers didn’t drop 4 or 5.