after beating crota on my 32 warlock mt group was nice enough to let me do it as my 31 and yes you can do hardmode as a 31 i was able to do the whole raid as a 31, the only reason we didnt finish crota was cause everyone was tired, we woke up at 4am to do it. So its possible to bring 31s into the raid, being said though i have maxed ghorn which enabled me to dps crotas shields easily
edit: we woke up at 4am to get on xbox, i know it didnt start at 4am in australia
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We did the raid till Crota with 3 Lvl 31 on the fireteam. However, we had not enough firepower for Crota. Our 31s (I was one of them) were not dealing enough damage to any kind of enemy especially Crota