His status shouldn't be in question. Bone-head penalties and playing to the whistle aside, he established himself as a top-10 RT. There I said it.
He's above-average at run blocking.
He's average at pass blocking.
In today's NFL, that is a top RT. Being average in this league, at a non-premium position is valuable and adequate.
He and Unger set the tone physically for Beast-Mode and Turbanator to do their thing. I think he's important not only for his play but for his place on this chip-on-the-shoulder, under-valued, under-drafted roster.
GB picked him up as an undrafted FA, who converted to TE in college from defensive end and made him a RT. Sort of like Sweezy's situation. In other words, The Russian will only get better as he gains more experience. His best days are ahead and we should be Thrilled, seriously, with his play and optimistic for improvement.
If he's the same player, or regressing, in 18 months, then we worry about replacing him. I would worry more about both G positions on the OL.