When last seen, Gin was standing on a building making commentary about the impossibility of anyone ever defeating Aizen, looking ambiguously sad about it. I note that there's no indication whatsoever that he knows or cares that Matsumoto just nearly died.

Or that he noticed Tousen's death, for that matter! Or that Wonderweiss noticed Tousen's death. Apparently no one cares but Hisagi and Komamura. I kind of felt like the guy used to be kind of important?