Bonus: A French interview with Gen Urobuchi, about Tokiomi and Sakura.
TMF : Did Tokiomi know what Sakura was going through after she was adopted by MATŌ?
U : What is important for Tokiomi is not filiation but magical progression in his family. So he is aware of literally throwing away (abandoning) his daughter. One can imagine that Tokiomi tells himself that, through his darling daughter, he will come to have superior thaumaturgical powers.
[Off interview]
Tokiomi knew that Sakura was going to suffer, but for him, it would allow him to become a real mage. As long as it increased the thaumaturgical potential of his family, he had no problem with Sakura's treatments at MATŌ. However, if he had known Sakura's fate, to be a vessel for Zōken, he would have refused. He also imagined that if things went too far, Sakura could stop Zōken by herself. Unconsciously, even if he never said it, the fight between Sakura and Rin at the end of Heaven's Feel was for him the best thing that could happen to TŌSAKA. Aoi, on the other hand, knew nothing.