I really don't get the Tebow comparisons, I really don't. And that's not a knock against Tebow -- I loved watching him play in college. But in his college career, Tebow did little to refine his passing game; instead, he became the ultimate "dual-threat" guy, rushing for almost 1k yards.
Prescott, on the other hand, started as a dual-threat QB and became more of a passing QB, his mechanics and completion percentage increasing dramatically each year. Prescott threw for about 1,000 more yards his Senior year than Tebow.
Also, Tebow's biggest mechanical "knock" was a long wind-up, whereas Prescott has a very quick release.
Just not seeing the comparison.