I plead ignorance, but how has Vujnovich looked? I'm wondering if he's been so bad that he isn't getting reps with the ones. If functional strength is the issue, the same was said about Bak his rookie year.
I never thought that Barclay had the feet to play at tackle, and he was very average at RT. I just can't see him at LT.
I think the best bet is to flip Bulaga if Bak will be out indefinitely.