The only recent "title changes" that took place on Smackdown were Orton beating Christian and the "Bryan beats Henry.....no he doesn't" moment that was probably the actual start of the Daniel Bryan heel turn.
As for Ziggler cashing in on a taped Smackdown, I can only see it if there was an injury they were covering up (Sheamus had been legit injured and they had him beat down by ADR, "injuring" him, and Ziggler came out and cashed in). I think that if it were to happen on a Smackdown, it would be a special live episode, which would do if they decided not to do it at a PPV.
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