Yeah no, roulletes and such dont really have such delicate balance, I already regularly do those with 4 dps or 4 tanks and still clear them pretty fast, theyre so easy I doubt a broken class would make too much difference. And tank BLU is pathetic, it does next to no damage and has to rely on diamondback to survive, a tanks job is not to just hold aggro and not die, its to lay out some damage too