I was in no way saying that Cardale should go because he will never be better, that would be dumb. What I (and my pops) were saying is that, as far as "unfinished business" goes, he HAS none at OSU (athletically speaking). I am thrilled that he decided to come back, and I think that, if all goes his way, he will be an even better pick in the draft next year. But let's say we DON'T win another NC next year. 'Dale might be a better qb, but his legacy will be (albeit only slightly) tarnished.
"Legacy" and "Draftstock/ability" are NOT the same thing.
If you changed your analogy to say "I've been driving for three days, and I just won the Daytona 500, I'll NEVER drive better than this!" it would be a bit more accurate.