I would rather the group kill it. The mob could regen and then it'd just be a back-and-forth when the soloist dies again, or it could depop and potential items could be wasted. And while we're on the topic of selfishness, didn't you hear your own point earlier? "I'd rather a mob depop than another group get it, because it and the items it drops are mine." My hypocrisy senses are tingling.