He's only been mentioned once so far, but I think he may be the pick. Prime Troy Brown. Having him on the field with Edelman at the same time would overload a secondary. They might have one shifty, quick corner, but now they need two. With Moss you may need the line to hold longer, and with Donald I'm not sure if that would be the case. Edelman and Troy both gets you quick wins, screens, and easy 7 yard completions all day.
Plus, another punt returner Edelman's caliber. Have them both line up deep and the punter may have to aim out of bounds. Or one shallow, one deep so that things like the Edelman near muff doesn't happen.
Lastly, Brown can play corner in a pinch.