Did your calcs include Leftovers recovery?
Just something I noticed.
Your chance of two shotting Weezing, Dusknoir, Milotic, and Blissey is reduced a fair amount from leftovers recovery (some of them having potential to cripple or kill you as a result of it). I did notice that your Cresselia calculations included lefties, but also used a spread that I don't think is particularly common. Kingdrom already pointed that out though. I like the idea, and seeing Nidoking usage increase would be sweet.
Factoring in Lefties and SR, Weezing and Blissey are still 2HKOed always with Milotic and Dusknoir being 2HKOed a lot of the time. I'll post up Crushking versus Restalker Cressy as soon as Metalkid loads for me/I remember.
And yes X-act, you are correct in saying that it doesn't get a giant range of switch ins like Metagross does. I still prefer it to sweepers Electivire (Who comes in on Tbolt, Flying and Steel) and Heracross (Who has no immunities, but comes in on Bug, Fighting, EQ, Grass).