I was about to say, Wirfs hasn't shown he can play left tackle.
Considering the free agent tackle we have all seemed to have targeted (Conklin) has predominately played right tackle in the pro's, if we're going to take a tackle in the top 10, from a fit perspective its likely to be Thomas if he falls, or Jackson.
Conklin did play left tackle in college, but I'm not paying big free agent dollars and having him switch. Pay him as a right tackle, let him do what he's shown he can do and lets go draft the left tackle of the future.