Byakuya did not like this in the least. He should know Ella-san's name at the very least. They both protected her. And Hitsugaya had been the one to introduce him to Rainbow Dash. This wasn't a good thing at all.

"Have you spoken to Unohana-taichou?" Because, yeah, she was the only doctor Byakuya trusted. And maybe she'd be able to tell something.