Standard KUUUUUUBOOOOOOOOOO factor is in effect as far as Uryu being named Stern Ritter A and Yhwach's successor, but other than that, I really enjoyed seeing the other Stern Ritter interacting with each other. So far it seems like they have a pretty interesting blend of personalities, so I hope they get used to better effect than the Espada were.
How many Stern Ritter are left, about 22 or so? The three that it seemed like Yamamoto killed are alive, so there are the three Kenpachi killed, Yamamoto's two real kills (Royd Lloyd and Driscoll Berci) and Kirge Opie. If you count both Yhwach and Uryu as separate Stern Ritter sharing the same letter, as Loyd and Royd were, that should be 22.