Can a troll have a kismesis and a matesprite at the same time or is considered cheating? I didn't understand that part of the quadrant talk.

Having a matesprite and a kismessis at the same time is perfectly fine, in fact it’s expected, actually it’s required for adult trolls from Alternia and punishable by death if you don’t have either. 

It’s not cheating unless you’ve got two matesprites or two moirails or stuff like that, ya dig?