And I agree with that, but with the way the NFL is functioning nowadays in terms of the importance of the QB position, I think you have to move on in some cases before you've become definitive.My point is, they all either sat the bench to learn for several years before they were exposed to the conundrum of the NFL, or they did no better than Tannehill has to this point. So, we can't yet definitively say that Tannehill won't be our Joe Montana or Peyton Manning. IMO, he's done as well to this point as I've seen any QB do (except Marino). Yup, he's made some horrendous mistakes. But, all QBs do. He will have to totally implode for the rest of this season before I'd say he's damaged goods and we should move on in our search for a franchise QB.
If you can't say the guy is definitively the answer after a certain period of time (which varies according to the QB and the situation), then you have to proceed IMO as though he isn't.