That was totally a fanservice episode for Rin fans. Needless to say, I loved it. Besides, it did have some merits beyond fanservice. Tokiomi is a character that desperately needed to be fleshed out, and this episode provided that. We've been shown he isn't a mere dick and that even he has a fatherly side. He seemed to genuinely care for Rin, which makes me wonder why he gave Sakura up to a walking penis worm. I suppose he might simply care for Rin as a heir rather than a daughter. I hope future episode will give us more insight about the man.
I wasn't too surprised to find out Ufotable altered the story, as I expected Rin to fail in her endeavor in the first place. I could hardly believe Rin actually manage to save those kids. It just doesn't fit the mood the story. In the end, my joke speculation about Rin accomplishing more than her father turned out to be right
Then again, it's not exactly hard to do more than a guy who spends his days sipping wine in his basement.