I'm glad they gave Winston his big moment as he's always often considered the one Ghostbuster everyone forgets. The breh worked hard after the team broke up and he succeeded and then then he gave back by buying the firehouse and secretly helping Ray out too. He never forgot who he was.
I remember reading that Dan said they cut a lot of Winston's lines out of part 2 for editing. He didn't like it.
But apparently Ivan Reitman, Bill, and Dan own the IP too.