I understand what you're getting at here even agree on most (yes I was very anti-Crouch vs Lunt not too long ago). I will slightly disagree on the quoted point however, just to play a little devil's advocate. Lunt has an NFL arm (take a look at Jay Cutler to see just how far having a crazy arm can get you even when you eff up all the time), and an NFL QB build. No he's not mobile, but neither is Tom Brady, and he's flourished in the right system, with a weaker arm than Lunt (No, Lunt will not be Brady, but nobody would have pegged the 199 pick to be one of the best ever). If Lunt finds the right fit he can be a camp arm that maybe gets lucky and sticks to practice squad and works his way up. Or maybe he impresses and lands as a 3rd stringer. No matter what, benching Lunt takes any NFL chance away. Lunt and Turner are the only 2 offensive players eligible to be drafted this year who even have chance of sniffing the league. Part of what Lovie is selling is that he can get guys to the NFL. Plus he's doubled, tripled and quadrupled down on Lunt as the better option. Taking out Lunt in his last year also seems counter to what Lovie tries to sell in terms of having senior leadership and getting guys to the next level (which his big sell after PT). I just don't see them rolling with Crouch in any way if Lunt is healthy.
I don't necessarily believe everything I wrote, just trying to come up with another, what I would deem reasonable, perspective.