I would have bet on Backlund. He's worn it in the past, during various injuries / suspensions for the others and, IMO, it seemed to give him a little extra boost to have that responsibility.
All in all, I don't think it matters who wears extra letters. In a good locker room, the good leaders will be respected regardless of the laundry. Maybe this decision serves to highlight that it really is a "new" team, and that the
new members are equally important.