I have a 32 warlock and a 31 hunter. my warlock finds groups fairly easily but its like pulling teeth trying to get a group for my hunter. Even now I have the hard crota cp and everyone wants 32 only. Thats ridiculous. I get the perks of being 32. extra resistance and damage. But I'd much rather an experienced 31 (which I am) than a 32 who is garbage. 31's are capable of doing the raid. I've done it before and I've been in groups with 31's. Frankly, I'm not the sword bearer so being a 31 doesn't make that much of a difference. I go invisible so nothing ever kills me (save for oversoul) and have maxed out ice breaker to snipe boomers. RNGesus has not blessed me with gjallahorn even though I've been playing since day 1. I missed week 2 when xur sold it. I've also been in a group of ALL 32s that failed because they sucked. made me wonder how they got 32 to begin with. I guess my point is that just because someone is a 31 doesn't mean they can't do the raid and just because someone is 32 doesn't mean they are better. I wish people would be more open minded.
Edit 1: I'm on 360
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When you're running your warlock and find a good group, ask them if anybody needs to do it again for alts. If that run went well, you'll probably find at least a couple people who won't balk at running it again with your 31.