XMen-Legend question
 

I don't have the manual, so please excuse me if this is an easy question.

When you are fighting with multiple Xmen, how does the experience work? Is it divided among the Xmen in your group or does all the XP goes to the guy you are controlling?

Is it better to work with the same group of 4 so that they are all at a high level or should you try to level all your xmen?