Who would it be? Let's limit it to the Les Miles era. As far as what I think, the defensive backfield is pretty set, but I wouldn't mind having Patrick Peterson back there again obviously, but he might not give us the biggest upgrade. LaRon Landry also doesn't fill a position of need.
Defensive line is young and relatively unproven, and I would LOVE having Glenn Dorsey back to pair with ends that can actually rush the passer (which Jackson and Pittman couldn't do great).
Offensive line is deep and set, but would anybody want to see a Ciron Black back there? And tight end is as athletic as we've seen it, even if Peterson lacks the consistency.
Running back I'd say we're pretty set, although it'd be fun to have a Trindon Holliday back to offset Ware.
Wide receiver we are definitely lacking depth (or are at least unproven), so I'd love to have Dwayne Bowe back for both the blocking and receiving.
Then the most obvious position: quarterback. JaMarcus Russell from 2006 would be unbelievable...I guess there isn't much competition for that replacement, unless we knew how Perrilloux would've turned out.
So for me at least, I think it comes down to WR vs QB vs DT. Putting Dorsey on the line would make our defense virtually unstoppable, adding Bowe would help our quarterbacks out hopefully to the point that we wouldn't need JaMarcus, but getting Russell would shore up our glaring weakness.
It's tough between Dorsey and Russell, but I think I would just go with Dorsey just because of how much fun it would be to watch our defense with him. What do you guys think?