Well....taking the question literally, only a QB can have a QB rating, so that would be Ray Lucas at 109.7 for 2001 .
Unless I'm missing someone on the roster who USED to be a QB somewhere else and has a higher regular season QB rating. Or someone who lined up at the QB position, wich I suppose technically makes them a QB for that play...maybe ?
Kirby wasn't a QB, I don't get how that works, unless your talking just plain PASS rating if he did a trick play or something.
It didn't come across as fluid as I had hoped. It was brought to my attention that Ricky Williams has a career passer rating of 120.3 on one completion for 36 yards. Just a tidbit that ended up being pretty confusing.