LW is and above average RT and he has done well in that capacity for the Bills. He is certainly better than Butler, or at least much more proven, at that position.
The Bills are fascinated with seeing how guys fare outside their natural position.
Walker, Butler, Wilson, Byrd, Maybin at LB, etc. etc.
I have a silly idea, why not try to play guys at their natural position and see what happens? Or, not dradft guys that connot play their natural position, in the NFL?