I have seen this theory before... Not calling bs but just pointing out, I'm terrible in the crucible. Like 1 kill and 14 deaths terrible and I have never gotten any loot from crucible matches, the only time I go there is when I have exotic weapon bounties. With regards to weapon choice, when I first saw this theory I switched from a scout rifle to an auto rifle. To this day I have received 3 legendary engrams and one exotic chest piece from a night fall along with one exotic weapon from the raid. Again I'm not calling bs just pointing out this theory didn't work for me