I think it's safe to say that Kelemete is the loss. Especially with Strief retiring as well.
As for his replacement we have: Bushrod
And I think Bushrod is an adequate replacement "IF" our starting 5 stay a little bit healthier than last year. Kelemete played a lot and did it at a high level. I think Bushrod can play at that same high level, but not if he has to play as much as Kelemete did. Stamina for the long season and some speed are the first things age takes away from O-linemen. I think he's good for 4 to 6... maybe 8 starts at guard in a pinch.