All it says is no ally available at this time. I have more characters I could put in. Is it a special slot for a heavy character like in heroes of dragon age? If anyone knows let me know please
6th squad is when you use an "ally" to help your team. You cannot use your own characters. I believe you need to reach a certain level before you can have access to "ally". I don't remember what level you get it.
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687-463-566
I have Chewy or Dooku as my leader.