Source powers are way over powered for the arena. It's basically get to source and 1 shot someone back and forth. Hopefully that changes at higher levels or I don't see the point.

Turn order needs to be addressed. With two teams having 1 of each class player 1 always gets to go first for each class every round barring some buffs. Initiative ties should have some random modifier so player 1 doesn't always go first or alternate the ties each round.