A 20 year span? hardly, the oldest one here is manning, playing his second season in 99...12 years ago.. these are all qbs that were legitimately better passers than tebow in or before their second season in the nfl. not to mention they make up 9 of the starting QBs in the NFL right now and that list is one off the top of my head.
As for why is cams name here, as much as I dont like the guy, he completed 60% of his passes this year for over 4,000 yards while rushing for 700-ish yards. Ya, he threw a lot of passes, and ya, Carolina didnt win shit, but Newton is still a better passer. More yards, higher completion percentage, higher passer rating (i know, its a garbage stat, but its a minor piece of evidence at this point). If nothing else, he's on there to show that being an athletic QB doesn't preclude you from being able to complete a damn pass. Wins are a team stat, not a QB stat and simply put, the Broncos have a better supporting cast than the Panthers. That said, I'd take Newton over Tebow despite the fact I cant stand Newton, I'd rather have a QB that can complete a pass.
Shit, Mike Vick completed 55% of his passes his second year in the league for nearly 3000 yards, a 2:1 TD:Int ratio, and a higher passer rating than Tebow had this year.
Oh and I can add Tom Brady to the list as well, a starter in 14 games his second season. Nearly 3,000 yards, higher completion %, higher rating, blah, blah, blah.
Broncos pariah Jay Cutler can go on the list too, nearly 3,500 yards, higher completion %, higher rating, etc, etc.
Hell, Trent Edwards had a better second season by just about every measurable stat. Byron Leftwich too, for that matter. And theyre both absolute garbage.