Bolded...I hope not. We saw that at RT he was not nearly as effective as he was at RG. He's a stud RG, a potential HOFer. He's an average RT. And LT is traditionally harder than RT.
I really hope Whitehair is going to be given a shot at LT. He played very well there. All the short arm/long arm stuff is somewhat overrated in my opinion. If a guy with X length arms hits at full extension, and a guy with X+2" length arms hits with a little bent elbow, it ends up being a wash. It also has to do with hip lowering, body angle, thrust, and a variety of other body angles that make blockers good or bad.