I don't know PVP, but what stops them from ganking your healer? With 5 seperate people, you can focus all your attention on moving everyone around, but with people in tow, you are pretty much sitting ducks. Your power comes in standing still, not meleeing and killing them before they get to you. And you can even lose 1-2 people and still make it work. If you have a dedicated healer, and they kill him first you are kinda screwed. Just my 2 cents.