Our line situation is the best its been in years. The Ravens are the example the Bills need to follow, get the best five people on the field--that may mean position switches, but get your best five out there. What makes a great team = Great players. Obviously you want to put them at their best positions, but if you have have two really good RTs and two mediocre RGs, well, make the move.
In addition, I think this gives the Bills some trade bate. It would surprise no one if, like last year, one or two of the back-ups is traded for a draft pick in the late camp days. When was the last time the Bills had that kind of depth?