Oh yeah, makes more sense there.. Clever I have to say by Biowares part. So disregard them, Grob only has a enrage doesn't have any "Special Mechanic" to begin with except for the pipe smash + magnet... So good reason to have an Enrage timer on him or it.
But then For Draxus, Bestia, Corruptor Zero, Brontes and perhaps Dread Council Remains.