Originally Posted by
Ryllharu
I wouldn't say that. He threw away Sakura, for sure, but he does give Rin undivided attention. Would he have been able to do the same for two daughters? Would one have developed resentment toward the other? (Though that happened anyway.)
He's a bastard, but presuming he didn't know exactly what Zouken intended for her, instead of two moderately well trained daughters, he gets to train one to the height of her abilities, and as far as he knows, the other is getting similar treatment. Then again, judging from Aoi's statements in the first episode...they probably do know.
I don't know if it is quite as simple as, "he chose to groom a successor instead of being a father." He was pretty fatherly to Rin in this episode. He was patient with her in a way he isn't to even Gilgamesh or Kirei.
(By the way, Sakura is much more powerful than Rin anyway. Tokiomi obviously threw away the wrong daughter if he was only after the best successor. The worms haven't consumed Sakura the way they did Kariya, and she's undoubtedly suffered as much as he has this past year. If that's not a testament to her potential, I don't know what is.)