An entire group of 31s I was just with did the Hardmode up to the deathsinger. No 32. We are fine. Just 10 percent less damage than you 32s.
Edit: I get that 31s can't do the entire raid on their owns like a 32, I'm saying why decline one for not being 32. If they can't pull their own weight kick them. Some can some cant.
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Would've never wanted to add a 31, but this 31 that I did it with was my friend from school I've known for years. We started it up, after a few hours we started our final attempt before I had to get off and at the first sword one 32 with ghorn got an error code and disconnected. We then proceeded to five man it one six person difficulty, with a 31 who hadn't played in awhile and didn't have good guns (he had a non maxed icebreaker and couldn't even stagger boomers.) We actually managed to beat it, and the other dude joined back and was happy he got free rewards. But yea, we five manned it with a 31, so it is possible :) Was also my first time beating it