We will know more less than 1 week from now.
Personally, I think Josh Sitton plays well enough and TJ Lang played well through injury all of last year. You just can't take that body of work through , what, 10, 12, 13 games last season with Saurday in there at C and get an accurate read. He was a HUGE liability.
If this OL can hold up well enough to beat SF in their house, I'll be pretty freaking happy.