Lol, I'm more inclined to believe that may be Brook. The reveal was too abrupt, and Zoro doesn't appear to be hallucinating, but instead woken up by someone who arrived at his location. Plus Brook has motive to disguise himself, as he is carrying Robin. She would be concealed under the robe.
My three issues with Brook is that it would be another case of Oda playing fast and loose with time. Robin and Brook were inside the heart of the dome, and yet still had the time to make it outside where Zoro is. Franky, for example, is apparently still following the trail left by King's attack. The second is that Zoro, Reaper or not, will suffer twice the damage he had sustained prior. From a narrative perspective, it makes no sense for Zoro to suffer that consequence if it isn't tied to a pivotal moment. If Brook is there, he will try to get Zoro to safety, thus robbing Zoro of the agency he would need to overcome the damage later. If he's on his own, he'll be that much more committed to take action, and not have someone prevent him from moving, which Robin and Brook would most certainly do. And I think Oda was very deliberate with where he placed Zoro after defeating King, that changing his location so soon, is head scratching. Lastly, it conflicts with the subplot of Robin and Brook trying to escape CP0. One of the plotlines will have to take a backseat to the other if Zoro joins them.
Well, either way, the Dome is collapsing because of Kazenbou. It's nice to see Yamato finally getting a moment after they were running nonstop in what felt like an endless goose chase. And now it's becoming clearer why Oda introduced Kazenbou. It's reflecting inside Onigashima the boiling pot which Oden had to stand on in his final hour. Oda will create this imagery of all the Samurai and allied forces triumphing the heat together. Raizo, while it's partly a gag, is unbothered by the heat, in a neat callback to flashback where the heat alone challenged his morale.
Izo looks fantastic while challenging CP0. It's Good, The Bad, And The Ugly meets Yojimbo during those panels. Izo, like Zoro, is a Samurai who incorporates western elements alongside his eastern origins. The perfect blend of the two, and the route Wano may yet take like its real world counterpart once the war is over.
Kid and Law vs Linlin could be much better. For one of the two most important fights, Oda doesn't devote nearly as much time with it as he should. I would've liked to have seen Linlin dominating Kid and Law, see how their attacks, while strong, still wouldn't slow her down. I hope to see more from Kid, too. He's been exuding some major backup singer energy since Law arrived, and as the only Conqueror's haki user between the two, he should have more to show compared to Law. The end of Killer vs Hawkins even noted him more during the closing narration.