Pino and Zak have played on all Who (or Who2 as they're affectionately known) gigs since John died, except Live8 - the rhythm section from another successful band, whose name escapes me at the moment (lack of sleep), played that show.
Greg Lake played bass on one of the 2 singles they released after John died - I think it was Old Red Wine, but it might have been Real Good Looking Boy (sleep again).
Keith Moon coached Zak on the drums personally. One of Zak's earliest professional activities was the drum tracks on John's album The Rock, which was recorded in 1986 and not released for about 10 years because of the record company execs being busted for financial misdealings. On that recording, he sounds like his dad - very straightforward timekeeping.
Also, the first known surfacing of the nickname TED was for the Who's brass, percussion, guitars, keys and singers-augmented megatour in 1989.
Re: Kenney Jones - he didn't try to mimic Moon, and the result was AMAZING live guitar and bass improv by Pete and John. Check out the much-bootlegged show from Madison Square Gardens in 1979 (they sing happy birthday to Kenney) - John takes his Spyder to the wildest places in Dreaming From the Waist, Magic Bus, Drowned and elsewhere. They also did Trick of the Light, presumably in the configuration of the rare photo elsewhere on this board of John on his 8-string Spyder and Pete on an older Sereis 1.
Last I knew, signing up to Pete's site is quick and free. That was indeed Pino at Yokohama. He plays solid bass with The Who, with an occasional foray out of the pocket. He's done the My Generation solo in at least 3 ways: as on the record, missing man formation where he leaves the 3rd (most difficult) run out entirely, and with some jazzy improv in the high register.
