With a drop rate already on par (or worse) than key salvage pieces, there shouldn't be any reason for no check on propagation. Even if they did this there is no promise the additional randomization will cause it to load in another loot pool, but it would be better than seeing 1 person get 3 bodies over the course of 24 battles while no one else even gets 1. Doesn't change the carrot system, but at least people aren't going to be let down just as much seeing the same person get the drop they wanted for the 3rd time when they can only hold 1 to begin with.