Main account is level 80. A is a new account with nothing on it.

You have an old account with level 80 on it. You make 5 new accounts "a" "b" "c" "d" "e". You will have 6 accounts total.

Old account is not linked to b/c/d/e.

Your old account might not have the class you want on it for when you make yur new 5 box team.

I added a line about 6 account in the OP to clarify.