it wouldn't even PROVE it if they made no draft mistakes....did the Patriots drafting Chad Jackson prove anything with him?
He has just as good a chance of being the best QB in this draft as anyone else at this point....but his chances aren't any better because he was drafted by the Pats and will spend the forseeable future holding a clipboard.
With any great team you can bring up someone that didn't work out, but you can't deny that they have had a lot of success finding real gems in the later rounds.