In his latest 2011 NFL Mock Draft, ESPN's Todd McShay made three scenarios for each team's pick in the first round. For the Detroit Lions, the three scenarios have them picking either Nebraska cornerback Prince Amukamara, Boston College offensive tackle Anthony Castonzo or a defensive end.
McShay's first scenario for the Lions is the so-called best-case scenario, which would be getting Amukamara. McShay explains that the Lions have a need there and Amukamara is somebody who could contribute from day one, so this would be the Lions' ideal scenario.
If Amukamara isn't there, McShay explains that Castonzo would be a good pick because he could replace Jeff Backus. I thought at first McShay meant that Castonzo could replace Backus down the road, but his write-up says Backus could move inside to guard. I vehemently disagree with this idea and based on what Lions coaches have said, I doubt it would happen.
The third scenario -- taking a defensive end -- is what I think is the Lions' second-best option. If Amukamara is gone, I'd much rather them take someone like Aldon Smith or Da'Quan Bowers or one of the other talented DEs than go with an OT.