I still have yet to hear a good reason why someone would use Air Lock competitively. You say giving it Insomnia and Shed Skin is giving it to abilities with the same purpose. Why not argue for Run Away instead of Air Lock; it practically serves the same purpose.
In addition to the Leftovers thing, Pokemon like HaxChomp and that annoyer Froslass say hi. I'm sorry, I just don't like HaxChomp too much, and I've seen what Annoyer Froslass can do. Not fun.
Plus, this thing would be an awesome counter to Blizzard Mountaineer Syclant (if anybody actually uses that). I think. Since they're going to be in the same server, from what I understand.