Gary
Can be abrasive at times (no joke)
Although Zapdos may SEEM like it can run a decent offensive set in OU, it's actually quite the opposite. It's still viable, but I honestly see no point in running Zapdos when Thundurus-T outclasses its offensive set in pretty much every way imaginable. It's MUCH more powerful, has access to Focus Blast for Ferrothorn and Superpower for the pink blobs, and can use boosting moves like Agility and Nasty Plot. Heat Wave is a cool move that Zapdos may have over Thundy-T, but it's so pitifully weak in the rain that it finds little usage outside of surprising an occasional Ferrothorn or Forretress. Besides, Thundurus-T can still easily 2HKO Forretress with Thunder, and Ferrothorn with Focus Blast. The only set that Zapdos should really be running in OU, is the specially defensive set, because Zapdos is actually quite bulky compared to Thundurus-T. Even then, it has more of a niche on stall teams or teams that are incredibly weak to a lot of offensive rain teams.IMO, if you wanna use a bulky electric, go for Modest Zapdos instead.
While it lacks a way to go mixed, Zapdos has much better bulk, and arguably better coverage in the form of Heat Wave. Once Lightning Rod gets released, Zappy will have an easier time switching in and setting up.
tl;dr Don't use offensive Zapdos in OU. Use Thundurus-T.