assuming Darnold goes #1, 4 would get us one of Rosen, Allen, or Mayfield. We know that our front office will want certain of these players and not others. IMO Rosen and his concussion history are likely make GMs think twice. The question to ask is which of these QBs is our front office likely to value higher than AJ. You could say, physically, Allen has the biggest upside even though he may not be as accurate as Rosen or Mayfield. Mayfield's rise from walk on to starter screams great character and leadership attributes. On the NFL Network Charlie Weis said he valued Mayfield the highest of the QBs likening him to Drew Brees and Russel Wilson.
I can't help but wonder if 12 is where Beane wants to be. He's not the type to do things by accident. I think McD's experience on the Panthers with Newton will give him the realization that having a player like Lamar Jackson makes up for other inadequacies like say a mediocre running game while still being a viable passing threat.