I can see it as a draft him and see what happens. Sit him behind Romo 2 years and he will probably play in some games due to Romo’s injury history. At that point depending on how you feel about both your QB’s you have either trade bait with Manziel (ala Kevin Kolb), you can release Romo and take the 5mil cap hit for 2 years while Manziel is probably still on a Rookie contract, or if Manziel hasn’t shown anything whatsoever you can just leave him on your team as a backup QB for longer and reevaluate each year. Trading Romo is out of the question completely. There’s no way any team will take the final 3 years of that salary and he would be too old to accept any kind of restructuring.No, I get your point and I didn't mean to suggest you were predicting it. And FWIW, I think Jerry has proven to be "questionable" in his decision-making. There's no way I'd have locked up Romo for that kind of money for 6 years. But they did.
But the point I was making is this: they have to play Romo for 4 years to eat through that guaranteed money. You can't afford to draft Manziel and either sit him for 4 years...or draft Manziel, sit him a year and then sit your $16 million per year QB as a backup to Manziel.
If they want Manziel they have to figure out a way to move Romo onto someone else's books. But even if they do that, they take a significant salary cap hit.