Chrataxe: Thank you. So many people forget to take into account the fact that LuxChomp is BY FAR the most-played deck, so it's not surprising it's taken so many wins. By no means is it not an amazing deck -- it's just that its strength alone is not what got it so many Cities wins.
Just like to point out that there was not a single LuxChomp CC's win in the state of Illinois, at least for Masters (not sure about Seniors/Juniors). The closest thing to a LuxChomp was Cody W's deck, and at least according to JWittz, that was more of a Sablelock deck than a LuxChomp deck.
I think Sablelock is actually harder to play than other SP's minus DialgaChomp, especially given the luck factor in it, which could be a reason why not many people played it. If you run Honchkrow SV and Blaziken, though, it /really/ helps a lot of your matchups and takes the luck factor out a little more 'cause the two of them help immensely against tank decks.
I'm personally a huge fan of Bronzong G in Sablelock. Not only does it help conserve the minimal amounts of Energy people play in this deck, but it helps immensely with getting Honchkrow SV set up more quickly. I would drop a Cyrus before I'd drop Chatot G, and that's no joke.
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I actually have to disagree with you with that last one, Darkmot. From what I heard, when Silvestro/Curry first came up with the deck, they were using it in a Cursegar-heavy meta, with a HUGE emphasis on donking.