I'm not so sure Gabbert won't have better success than Kaepernick. If he can read defensive schemes and call audibles at the line he's already a step ahead.
I take it you don’t watch many 49ers games? Maybe one other QB in the NFL could make the throw he did to Boldin in the third quarter. He had a QB rating of 128.7 in that game. But a QB can’t do much with no game plan and no support. Against the Rams he was playing without a running back.