It makes sense that as Evans and Corbett played more and the starting five of Whitworth-Corbett-Blythe-Edwards-Evans settled in that they played better.
I see lots of complaints about Blythe's contract but he really did play pretty well overall there in those 7 games. They may very well draft a center in the 2nd or 3rd round but I'd find it unlikely they would be a week one starter. I still look at LG as a very logical place to draft an OL in the 2nd or 3rd that can compete with Corbett right away and perhaps unseat him by midseason.