[X] Blast Shadow Shinji off the bat with his...special ability, as he will be the most dangerous if he is left alive. From there Shinji will support Natsumi and Amber on their Shadow forms to outnumber/overpower them. Suggest that Natsumi to use her luck potion for the end bosses.
Good thing we voted for teamwork training back then, yeah. Ought to help during the whole challenge. I agree about taking care of his Shadow's first (we don't want to see what happens if it gets triggered when you defeat one of the other shadow first) and then maybe Natsumi's (in case her alter ego has access to mopsus).