fNo, my point is to use one of your existing level 70 toons as one of the four. Only level up three others to compliment the 70 you choose to "keep".
Druid is very versatile and could be specced as the tank, DPS, or healer. Use the other three accounts to build support around him/her. That will be the fastest way to get a four box team at 70 or 80. Period.