I agree that there is no difference. However, this move (to me) strictly revolves around Tuel sucking against the Browns to a degree that the coaching staff did not imagine. As a rookie backup the coaching staff essentially had no idea how Tuel would respond if he had to go in there in an emergency. Tuel can look great in practice, he can know the playbook, etc. But until he actually went into a live game that counted, no one knew how he would do.
After seeing what he did do (which was an abomination), the coaching staff figured it would be better to give someone else a shot. Here comes Lewis.
Can we blame the coaching staff for having Tuel as the backup? Maybe. Sure. But when the alternative is Lewis, we can't be shelling out THAT much blame. They figured Tuel would be ready and he clearly wasn't. Tuel was not able to step up to the plate - which is also partially his fault. They were wrong - much the same way they could be wrong this week if Lewis comes in and throws 3 INT's vs the Bungals.
In other words. When you go "all-in" on EJ and have horse manure for backups, this kind of scrutiny ensues.
Life as a Bills fan.