Yeah, when I read about the Skirmishers, the first thing I thought was "an excuse to keep using that terrible Halo 3 Brute AI?" As for the grunts, I hope what they showed us was just a subvariant, because that's the wrong way to go to make them look menacing. And, they are grunts for crying out loud, they aren't supposed to be that menacing, even if Jackals and Elites are.