In the comic when Mickey, Oswald, Felix and Bimbo arrived at the abandoned Sillyvision studio, is it when they met Bendy and discovered the studios secrets? Also, I had a thought Oswald was like "I guess that Bendy character know how I felt when I was forgotten or abandoned."
Something like that. Though in the case of the comics I’ve made so far, the others knew about Bendy (with Oswald, Mickey, and even Felix trying to be friends with Bendy), but not knowing about the secrets of Joey Drew studios.
In this particular scenario, the toons wouldn’t be going there to learn about the ink machine and all its secrets, but to find out what happened to Bendy, Boris, Alice, and everyone else at the studio. Finding out more about the ink machine would just be part of their search for answers as they try and figure out what happened to everyone at the studio, and why everyone who has association with the place seems to have disappeared.
And yeah, in terms of feeling forgotten, I bet Oswald, and maybe even Felix and Bimbo, feel sorry for Bendy. Can only imagine some of the tension between the other toons and Mickey in that regard.