I'm in complete agreement with a solid backup at Center. McCoy is good, but he really struggled to stay healthy this past season and I don't think its a good idea to go into next season without a backup your confident in.
This is why I'm watching Jake Majors. He played Center at Texas and was extremely solid, but could also interchange to guard as well. A versatile backup Center that like that is a massive boon incase injuries strike. The problem, is he may end up being good enough to replace McCoy after a couple of seasons, which is a great problem to have.