They're called Carries. Although in LoL it's rare that they can solo an entire team, unless it's one of the veterans against a team of noobs. If you're saying that when he's supported by his team, he's the one that does all the damage and gets all the kills, that's an entirely different situation, and one that I don't think there's much problem with. And honestly, I haven't seen that in a while, because tanks are so *&#$% hard to finish off. On a related note, I hate all you Rammi with the rebirth armor.