Quote Originally Posted by DarthEnder View Post
Granted, but the members of Taka have saved his dumb ass, like, a dozen times now. Karin literally JUST got done saving his life AGAIN.

Danzou is not the last person he intends to get revenge on. You would think he could recognize that he NEEDS these people in order to reach his other targets. But literally, the instant he might get slowed down 3 seconds by one of them, he abandons them, or worse.

"Karin, you've become a burden to me by getting taken hostage. It's okay, I'm sure I'll NEVER need healing or a sensory ninja again at any point in the future when I intend to invade Konoha to go after the other two elders. This mild inconvenience outweighs all that."
In my opinion you are forgetting something about Sasuke. He has been trying to catch up with someone for as long as he has lived. And continuously failed at that, to boot, even if he has kept trying to tell himself otherwise. Moreover, as much as he later in between hated Itachi, he was still Sasuke's role model in the beginning and in the end, and Itachi was really a perfect example of a lone wolf (at least superficially). So, I think having Karin around to heal him conveniently wasn't actually a positive thing for Sasuke but rather something that reminded him of his own weakness every time. Maybe he was smart enough to recognize the need for her back when Taka was formed and he was weaker, but for all we know he might have been only, subconsciously, looking for a perfect excuse to get rid of her by now. It will mean he can't depend on miracle healing anymore, but on the other hand that will force him not to get screwed by his opponents, that is, to get stronger as an individual.

It's not overly wise strategically in the bigger picture but I deem it suits Sasuke's personality 100%. He fancies himself an avenger and it's not an occupation for jolly company. An avenger can build nothing and has no future, after all.