If someone playing knew Marle was going to run solo during parts of the game, then I think it would have been more about working up her techs early on so that she'd have a more diverse set during the solo play. Though the idea of a multi-hit tech for Marle is amusing. I could imagine her throwing multiple snowballs at the enemy. You could have also had a weapon designed for her that could have dealt a bit more damage.
anonymouse: After Sorin sacrificed himself to destroy the Dragon Tooth, the Reptite events never occured. This chapter, I'm taking it, is showing what happened to the others after the tooth's destruction. Thus, everything we've seen (and will see) happen to Marle, Robo and Lucca now hasn't happened.