Can't say, never played a mage. But you wouldn't be able to balance out the agro as much. Your mage would either pull too much agro and then defend himself with cloth or do less and if it's doing less, not be able to grab agro. Your spells would be casting at differnt rates. I also have my shocks mixed so 4 cast earth shock, but one casts frost shock which has higher threat and I can pull agro off a charater which might be taking too much of a beating. I'd personaly just level 5 guys then if you want later on mix and match to suit your play style. Just have fun, your playing a video game.