User blog comment:Salubri/The Thousand-Year Blood War arc Plot Points/@comment-11051098-20131129205538

"The villains in this arc are few in number but their numbers will increase."
 * True. When we first saw the invaders, it was Ebern + the 7 masked intruders who proke into Yama's room + Driscoll Berci who killed Sasakibe. So around 9 at the time.

"(Ukitake) has undergone a bit of an internal change."
 * Could mean that Mayuri have created new organs for him, similar to how he replaced his own organs with dummies before going to Hueco Mundo to fight Szayel.