I recently completed a Crota's end on hard with two 31s(including my self). Only a couple of the 32s had gjallarhorn and no one had to double tap.
I personally don't know why we have people saying that you need it to beat Crota. The only time that's slightly true is if you're solo. Even then it's been done with Hunger of Crota.
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Only want it so I can try solo Crota