Toshiro would have used his bankai once the battles progressed, which they naturally did. He probably fought close to Rangiku. He did notice Gin was there and was wary at first, but he didn't try to get into it much with the traitor.
Ichigo fought, but not for the reasons that everyone assumes. The undead were going to hurt people, so he was fighting to protect. He's not as badass as he is in canon yet, so he can't yet do bankai, but he did what he could in typical Ichigo fashion. I mean, c'mon, even Ichigo before he knew bankai could go up against Kenpachi and survive.
Yachiru had fun. Plain and simple! She went killing things and do whatever she could to keep moving. She didn't even use her sword much.