We got Konso'd. Being Konso'd is, like, the definition of a thing which takes away hollow powers. Zangetsu isn't a hollow anymore, just a technically-a-plus creepy guy. He's still very powerful, because he was only purified, not removed, but he can't pull the body-stealing thing any more.
To be fair, it's debatable in canon whether or not Zangetsu even wanted Ichigo's Body. After all, Zangetsu is, essentially, the personification of Ichigo's Instincts. His Instinct to eat. His instinct to find Shelter. His instinct to procreate. All the typical stuff, but most importantly:
His Instinct to Fight. His Instinct for
Battle.
His instinct to Survive.
The biggest theme on Ichigo's relationship with Zangetsu -Both Hollow and Quincy- was Instinct. Everything they ever did was to protect him. When Ichigo was in danger, Old Man Zangetsu let up on holding back his powers, letting him get Shikai, and then Bankai. Whenever Ichigo was in danger of
truly Dying, like in his fight with Byakuya or Ulquiorra, White Zangetsu took over. Each and every time Zangetsu acted, it was to keep Ichigo
alive.
Half the reason Zangetsu is pissed at us is because we died. And we didn't die because of something that was out of our control, we died because Ichigo
ignored his Instinct to Survive and jumped in front of a moving Truck. To save his sisters, yes, but it means Zangetsu -both of them-
failed in the one thing they wanted to do.
And now, we're a Shinigami, and we're
still fighting Zangetsu!
We are fighting our Instinct to Survive! Zangetsu failed once, seeing Ichigo
continue to fight him, to continue fighting his instinct to Survive? That must frustrate him to
no goddamn end.
People keep viewing Zangetsu as something that needs to be controlled or beaten down. They keep viewing him as a petulant child that needs to get over not having his way. But that isn't what Zangetsu is about, at
all!
All Zangetsu wants is for Ichigo to understand that his life is important! That his survival matters too!
Tensa Zangetsu says it outright in canon. The only thing they ever wanted to protect, was Ichigo. And if we want to be the best we can be, we need to make qualms with that. We need to understand it, and come to terms with it.
EDIT: Haaaah, great. Sorry, this turned into a great big rant, but I've kind of been frustrated with people in thread just
not understanding Zangetsu or how to deal with him at all.