33 pages half-filled with clueless trolls I'm going to not bother reading can be ignored for teh most part. It's pretty simple really:
1. Paizo runs basicall all physical distribution through Diamond, WotC only runs partly through Diamond with direct sales to large outlets. Would I believe Paizo sends more physical product through Diamond? Yeah, but that doesn't account for WotC's Amazon numbers, etc. which are rather large even without knowing exact numbers. It also doesn't account for WotC's digital offering numbers. Nor does it account for related sales (non-gaming books written to supplement the product, ie: the Swordmage series written by Rich Baker the "new Mike Mearls")
2. When a short while ago numerous people were chiming in about ic2v's numbers for a month showing paizo on top FOR THAT PERIOD ONLY now aren't citing that source that it shows WotC on top again.
3. Cycles of product release. On down months for WotC releases Paizo still has their consistent AP subscriptions. It's not out of the realm by any stretch to know some months with similar numbers to others will look stronger or weaker in comparison. especially when you consider...
4. Pathfinder is still in its early childhood, expanding and still new (ish) while 4E is a more mature property with a slower physical publishing schedule at this point.
Nice to see the diehard 4E defenders firmly in denial. No one could possibly sell as much or more rpg books than WotC. It's impossible. Face it. Paizo is having tremendous success with Pathfinder even though they can't put the D&D label on their products.