User blog comment:Linathan/Squad Spotlight: Metal Parade!/@comment-70.173.62.230-20150312154110/@comment-26140304-20150312203629

Thanks! Well, Duel-SGX is only used temporarily as a leader and you can use any friend for all of the squads mentioned above.

As for Rosetta, yes. You are able to deal 3 damage to the metals with her SBB buff. Added.