Exactly. And on top of that, Dream World Chandelure is probably the most dubious of anything currently in Dream World OU of ever being released. Obviously Keldeo, Genesect and Meloetta are gonna premier as part of the inevitable movie promotion cycle of Gen V, and game freak's not gonna code something like Imposter Ditto that's awesome as balls and slick as butter and not release it. Remember, Gen IV lasted for like 4 years and I wouldn't be surprised with the huge amount of Pokemon game freak released and the amount of hidden content they wanted to drip out that we have another 4 years of sequels and rereleases coming up. But asides from stupid crap like Zen Mode Darmanitan, there's no indication of Dream World Unova Pokemon ever being released. While everything has appropriately flavorful abilities, a lot of them seem pretty much thrown on. Shadow Tag Chandelure might the equivalent of if we fought RBY with stuff like lvl 255 Golducks from the coast of cinnabar turned on (though actually for the metagame worse because those golducks couldn't do shit if you weren't in a link cable battle and thus actually had pretty bad stats cause they couldn't get stat exp.).Decisions made around the DW metagame are going to have no bearing on the tiering of Pokemon in the standard metagame, I'd wager. If Technician Breloom, for example, was released next week almost all experience of using him in DW will be moot because he has been competing in a metagame with Soul Dew Lati@s, Keldeo, Genosect, ST Chandelure, Lightning Rod Zapdos, yaddayaddayadda - you get the idea. It'd be unfair to ban him if you (hypothetically speaking) found him to be broken in your metagame so he'd need to be tested in the official metagame. It's unlikely that the metagame you play now will ever assimilate into the standard metagame because of the stunted rate at which Nintendo release new Pokemon.
Also hilariously the fix to Shadow Tag in Gen IV to stop Wob vs. Wob makes Chandelure (as well as I guess Wob and Gothy Style Jynx though neither get anywhere near his usage) the only Pokemon he can't trap in the metagame.