For all we know that Zetsu on his body is actually the tobi personality and they can switch control of the body back and forth. =D
That's what I thought too. The wearing-spiral-Zetsu-thing was a one time arrangement (or a few times at best), afaik.

It could also be that Obito had a white Zetsu parade around as Tobi at times. Oddly enough, I'm fond of the personality that the Zetsus show when Obito was healing in Madara's lair. That personality is rather close to Tobi. Lots of interesting speculation here. Of course, I don't have any conclusive evidence.
I too miss the funny Tobi
