This was a fine episode, even if objectively speaking it couldn't have been anything but service for Rin fans. It didn't exactly advance the bigger plot. I suppose the inevitable betrayal will feel even worse the more Tokiomi's good sides are shown, and further attachment to Rin is created. But if Fate/Zero is forgotten for a moment, this episode actually benefitted Fate/Stay Night. You can certainly see Rin was Rin even all these years ago.

I'm also really happy it didn't turn out to be Rin inadvertently hampering Tokiomi's plans, not that I'd have expected such from Type-Mooh.