Talonflame doesn't get Defog. Ferrothorn can set up in Skarmory and Crobat's face, although they do get Defog, unless it gets Whirlwinded. Meanwhile Chesnaught does zilch to either of the premier OU defoggers without Stone Edge.
If you switch to TTar while Crobat uses U-Turn that puts you in a bad place. Once the Defogger switches into Chesnaught, they can do whatever they want, while you have to switch.
Skarmory is easily trapped by Gengar/Magnezone. But it gets Defog, one of two currently OU-viable mons to do so. You have to play a lot more carefully with it nowadays. But that's irrelevant to the Chesnaught discussion.
With Chesnaught, it's a bit easier to remove his hazards, simply because the two main Defoggers and two popular Rapid Spinners in OU force him out very easily, and three of those mons can switch into him too. Plus Forretress doesn't have to Spin, it can Volt Switch out of your obvious Aegislash. Crobat can U-Turn out of your obvious Tyranitar. Skarmory doesn't even have to run Defog, it can just set up its own hazards and start doing its own phazing.
If you look below Crobat and Skarmory as Defoggers you have a whole ton of Flying-types come Pokebank, so then it'll be a lot harder to use Chesnaught. Unless you run Stone Edge over Roar or Hammer Arm.
Newsflash: What can Ferrothorn or Forretress do against Defoggers? But for some reason, you seem to have this illusion in your mind that having a 4x weakness to flying somehow makes you more vulnerable to defog. Defog can only be stopped by Taunt! The only pokemon that has access to Spikes and fast enough to Taunt, is Deoxys-S. So by your logic, it's also easy to remove ferrothorn and forretress's hazards as well. Let me make this clear, Defog is not a good argument. Every OU Spike user outside of Deoxys-S, cannot do anything about Defog, it's not something exclusive to Chesnaught. Also, if you have been playing Showdown, you should realize that most teams carry Excadrill with rapid spin over a defog user. Why? Well mainly because Excadrill is the only Rapid Spinner that can't be spin blocked due to it's ability to defeat every spin blocker in the game! That's why there are very few people that use Defog. Any team that carries a Defogger, mainly use Defog under extreme situations when there are too many hazards set on their side.
Anyways, back to the point, there are only 3 good spikers in BW2 OU, Skarmory, Foretress and Ferrothorn. Chesnaught will be an excellent addition to this mainly because of it's ability to check/counter and set up spikes on the best Rapid Spinner in the game, Excadrill. But in addition, many teams require a bulky grass pivot. Most people opt for Mega Venusaur, but a lot of teams don't have a Mega Slot. Chesnaught has more defensive bulk than Mega Venusaur, and should always be considered for a slot on any team, because it can also provide valuable hazard and phazing capabilites as well as being a bulky grass pivot, something that Mega Venusaur can't provide.
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