I have yet to see a lot of 31s beat the raid tho. There may be some out ther but if it was that easy they'd flood the forums. I've have a 31 on CE hard and all 32s and I can tell you right now it's a big difference. He was doing good also holding his weight(even tho a few times a knight would one swipe him)but that weight just isn't enough to make it more easier on the fireteam. Like I said I don't doubt 31s can't beat the raid, but you'd had seen it commonly if it was true so no it doesn't really count as far as fighting crota himself goes