If you are kicking people for not meeting these requirements its you that needs to "git gud".
My raid group just beat the hard Raid with 3 31s and few ghorns with only a couple wipes. This is not to say you need to lower your standards quite as low but at least ease up on these stupid requirements.
If someone is having trouble beating the raid and doesnt meet those dumb ass reqs post here and hopefully I or another helpful guardian will aid you. Happy Hunting :)
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After getting ghorn I realized it's far from a necessity for crota. Infact if you have a good team it's waste of an exotic slot. I noticed everytime I shoot at Crota, the wolf pack rounds do no damage. All I see is "immune, immune immune" on my screen, cos Crota goes down way before the wolfpacks hit. One of such occasions was when I run normal mode with a group of 31's , two of which had blue rocket launchers.