Might be bullshit, but Zimmer had some negative things to say about Manziel.
The only team I think is a threat of those you listed is Cleveland, with their second pick.
The biggest failure was Dallas simply telling him to go eff himself and keeping him inactive the entire year.
Cutting him with a failed physical designation pretty much acknowledges, at least from a legal perspective, that they did check him out. The fact he healed in a few weeks is nothing...
It is better than recent years which saw players like Christian Ponder and E.J. Manuel get picked in the first round.
The issue is that there is not one guy who is an Andrew Luck. If there was, people would be stating it is "deep".