I think we are in the market for all 5 OL positions really. Players with position flexibility are even more valuable. Pouncey has a lot of baggage and is 1 year away from constant negotiation destractions. I'm not ready to sink 8-9M into the C position once Pouncey's extension runs out. Barring a miraculous gelling of an OL that is stacked through this draft, we will have no real reason to overpay.
So yes, I'd be in the market for a C, but the need comes after locating a RT, LG, RG, and even another LT. So, not sure whether we get to it this draft. If so, it will either be a RG candidate this year or a late round guy who has OG potential at least.
Brenner has the movement skills but lacks the core strength to play along the OL. While it is possible to add strength, these guys have been trying to do that for years, and it isn't very likely he makes a big jump in power in one offseason.
There are a lot of C/G candidates in the rounds 5-7 range and some who may go undrafted in this deep draft to consider.
Someone mentioned Wesley Johnson as an OG. I really like him as a late round selection.