Zapdos apparently doesn't cut it anymore. Reuniclus, Conkeldurr, Virizion, and DDNite does bulky offense better. Even with Thundurus gone, Zapdos will still struggle to shine with its ordinary Speed and ordinary bulk. There's also a lot more threats that can wall Zapdos this gen, namely Latias, Gastrodon, Quagsire, and specially-defensive TTar (an uncommon sight in DPP).
If you want to use Zapdos for specially defensive purposes, you're better off using Latias for soaking up Fire, Water, Grass, and Electric moves and Jirachi for soaking up Flying and Dragon moves. Until Zapdos gains LightningRod to add an ELECTRIC IMMUNITY to its distinct pool of resistances, it's also outclassed in the defensive department, imo.
Feel free to prove me wrong, though. If you're looking for a Thundurus replacement, Rash Raikou with Aura Sphere does it better, letting it have a chance against Ttar. Even then nothing does electric special sweep quite efficiently as Thundurus (miss you :/)