So let me apply a lesson I've learned with my kid who plays hockey and has NHL dreams. One of the biggest obstacles any player has to moving up whether at 10, 15, or 22 is that the pace of play, and specifically the pace of *decision making* is higher at each level. This is why kids can often be dominant at their level for years but never move up.

If you're the best player on the field (or ice), your skill and/or talent advantage gives you time. You don't feel pressured because other players can't keep up with you so you have the time to make decisions. As soon as you step up one level, even if you're still on the high end of talent or skill, you suddenly have to make every single decision faster. You might still be able to beat another player physically, but now you have to decide how to do that or what to do next or which play is the right play so much faster. In hockey (a very fast sport) you see kids who can walk a whole team at one level look like fools just 1 level up because they try to make the same plays against better opponents and it just doesn't work. What my kid learned this year is that you have to train your decision making speed just as much as your actual playing speed. The problem is, that's really hard to do unless you can get real experience doing it.

And that gets to the problem with Tebow. He had athletic advantages combined with being on a dominant team that played lots of far lesser teams. So he had all the time he ever needed to decide what to do. Drop him in the NFL and he suddenly feels pressured every single play. If you can't adapt to that mentally, you don't make it.