If he worked on it at his day program, I take it he was a jerk only so he wouldn't tell? I sort of get that but what do you mean by "jerk"? Was he just preocuppied and just wouldn't talk to you or was he on the offensive and deliberately starting things?

I guess I would take all the things you hear about him with a grain of salt but keep them in the back of your mind in case some behaviors come up that you're not sure of. The being a jerk/apologizing thing is not a very good start? I could see someone like that "blaming" his seizures for not being in control of his actions, etc. I'd just keep things in mind and only let him make a couple more mistakes before I decided he might be more trouble than he is worth?