So Rin's father was Gilgamesh's previous master?

It's possible that Rin's father died and Kotomine lost his Servant, leaving Gilgamesh and Kotomine to make a new contract.

Where's Kariya's? I want to see what awesome symbol Bazaka gets. Probably the same as FSN Rider's though...

Kotomine lost his Servant against Saber, and since he set Kariya and Tokiomi up, he stole Gilgamesh, who was without a master. Or at least, that's what I suspect.

No love for Kariya ;_;