Let's take a look at some random Blaine Gabbert passes and see what comes up, shall we?
San Francisco 49ers quarterback Blaine Gabbert was neither good nor bad last season. What Gabbert was ended up being rather simple: he was better than he was before. The most important thing to consider when thinking about Gabbert and his ceiling is the fact that it isn't a question about whether or not he can improve. He has improved.
How much he's improved or where his ceiling actually is at this point are things none of us can quantify.