i think you need a far stronger read before you start sticking 100bb in preflop with AJo. like kmind, i've lost too much money in the past acting on what i thought were "reads" over a largely irrelevant sample. although i'd definitely stick around at the table. there is still a decent chance this guy will be spastic or far too aggressive (plus he's to your right so he can only really give you trouble 1 or 2 hands per orbit, because position is the nuts) and that sitting to his left will be profitable for you. but for the moment just pay attention to him, gathering reads for when/if you do eventually clash, and don't make any non-standard plays.