He already said that he let results play a part in the tier list, as they should of course. We're not seeing anything revolutionary with his criteria. Depends on your definition of "horribly" out of place, but Greninja is in the wrong group.
Dabuz
thinks Greninja has the theory to be higher but doesn't have the results for it. But while Greninja does lack top level USA rep, we're not talking about Jigglypuff here. This is a character that is a top 15, possibly top 10 threat in Europe, with decent results in Japan and actually better regional results in the USA than he's given credit for (thanks to Gibus, Venia and IceArrow). Dabuz is not fully appreciating what the character has achieved and the placement is simply 3-4 months out of date.
Greninja's placement caused a big reaction judging by this thread (not including myself, there were plenty of raised eyebrows) and Twitter. There's plenty of agreement for Greninja being higher. I don't know what else the character has to do to get recognised when characters above him like Pit aren't doing much in the USA, and Pit's Japanese placements are comparable to Greninja's European ones.
As I said, I rarely bother to defend Greninja these days and I appreciate that results speak louder than words, but his results aren't being properly appreciated here. To put him in the wrong group just doesn't make any sense.
And yeah, the hipocracy of the Pika/Ryu placements on the official list is frightening, but to be fair that list's for a previous patch and had lots of collaborators.