Let's take a look at this just for discussion sake:
Barrett : 6381 yards passing, 69 pass TD's 21 int's (QBR 148. 9); rushing 2465 yards, 31 td's
Tebow : 9285 passing, 88 TDs, 16 INT (QBR 170.8) rushing 2947 57 tds
Now for fun, since JT has one more year left, let's throw in a season that meets his statistical average:
Barrett Projected: 9075 passing yards; 98 passing tds, 29 INT (QBR 148.9); rushing yards 3406 rushing yards 41 rushing TD's
Tebow : 9285 passing, 88 TDs, 16 INT (QBR 170.8) rushing 2947 57 tds)
So we are clear, for the averages, I only averaged the two seasons Barrett completed (did not use 2015 as that would have skewed the totals. But lets not lose sight of the fact that if JT started and stayed healthy for the full 2015 season, his yardage and td's/int's would be significantly higher).
Ask me which is better, I probably give the nod to Tebow based on a higher QBR, better td-int ratio (which is a huge part of QBR), and more total TD's. But it isn't a landslide, it is very close (JT would have more total yardage and more total TD's per game played).. If JT plays 13 games this year (scheduled 12 and a bowl), his numbers would be in 49 total games while Tebow played 55 total games. If OSU wins it all and JT starts, well the games go up, but so will the numbers (hopefully). This is why a lot of us find it absolutely insane that people are calling for unproven back ups to start for a guy that compares statistically to one of the greatest college qb's of all time.
BTW, don't bother me with talk of championships, as I don't humor championship guy. A lot goes into winning a title--qb is a big piece, but it is a team effort, and I don't credit qb with titles won (it is the same reason I didn't bother with team wins either).