That's the issue, technically he has alot more xp, since he basicly will have 5 characters in one, at the same time, only different triggers will cause the switch.
How he's set up is
If he's around nonmilitary computers, he's a nerdy computer hacker, if he's in a combat situation he's a soldier, if he sees someone hurt he switches to a religious doctor, if he gets hurt he becomes a berserker, and his 5th personalty is a drug addicted salesmen. He'll take a compulsion check each time to see if he switches.