"The 49ers would be left completely exposed if a tackle went down.McNeill could also provide a possible stop-gap at guard if Alex Boone did not work out, leaving the Niners in need of veteran experience in a hurry.At 6'7, 336 pounds, McNeill is an imposing player and very experienced left tackle that could even provide insight to Joe Staley and Anthony Davis???even though they are not much younger." . . . . .