Yeah, this is probably right.
It couldn't have been that the rest of the tackles were rated below the choices that we had on our board, which is how the Bills run their draft (no secret there). Or that they are comfortable with Walker at LT, where he practiced last offseason and started while Peters was out. Or with Chambers, who stepped in and played last year in all 16 games, starting 2 at LT. Or with Bell, who the coaching staff is high on, and people like you and I know absolutely nothing about. Or any combination of the 3.
You're right, it is probably a self detonated grenade so that he can leave and coach elsewhere.