Good data my only issue is your comparing an exotic to a legendary if you want to prove its better compare it to Ghorn... Hunger of crota is not going to do more damage than an exotic i bet if you compare hunger to Truth at 331 you'll find truth does more damage than hunger but if you dont have an exotic rocket launcher then the best legendary you can get is hunger of crota.
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The extra damage that came from nowhere is from the rocket making contact. Happens with certain grenades too.