None. That Einstein still had situation when he would pick the wrong weapon from the ground, still wouldn't always use his skills at the appropriate time (I would expect at least to trigger one of them in the first round 100% of the time) and his overall fighting competency didn't seem to improve noticeably compared to the twice dumber gladiators in my stable.
@weaw, you can also consider Bloody Spectacle - that's extra Attack Power and bleeding.