The good thing is your group will be solid for PvE since you can have a healer and tank. For PvP I'd suggest dropping a Druid and adding a rogue.

There were bans for the abuse of game mechanics, but we don't know why. The bans occurred when the player was using both the mount and the vendor methods. In my opinion, not based on anything but my views, the bans occurred because of the vendor. There is a big difference between using multi person mounts, something that has existed in PvP for a long time, and the vendor which is a clear abuse. I feel comfortable with the mount method, and it was worked without an issue for about 10 hours of BGs so far, but you never know.