Yeah, looks like a 20" to me too. He also sets up a secondary kit on his left, with some bigger hats, a ride, snare and a sort of small diameter cannon-like bass drum. (a 16"x20" maybe?) I thought your thread was about that one!!! hehe.
Awesome player. Pure groove.
Steve Jordan + Pino Palladino = Probably the best possible rhythm section. Any guitarist's heaven.