Totally agree, I don't think you lock in on any specific QB either. Here my concern: If Tua gets picked at #5 by the Phins, I am good with the risk. To give up multiple first-rounders for someone with his injury history would be a HUGE risk. I realize brutal sports injuries happen, with Tua it has already happened.
In addition, I imagine if Tua is the pick the Dolphins will slow play him. If he plays at all it will most likely not be until the very end of the season. If that is the case then the Dolphins still will not know what they have. This would set the Dolphins back even further if Tua does not work out. That would be bad enough, throw in that he cost multiple picks and it cripples them even more. I say let the draft come to the Dolphins. I am good with Tua, but going all-in with multiple picks for him.