Why did Winston not help in the Courtroom?

He was originally intended to. He appears in the audience of the courtroom scene briefly then disappears. During filming, the scene was changed to draw more of a parallel to the first movie ballroom scene with the three original Ghostbusters who started the business. Fan speculations have ranged from... Winston having another commitment or job to attend. Not wanting to get in trouble with the law by violating the restraining order preventing them from busting ghosts. There were only three proton packs. He helps calm people and keep order outside the courtroom. The ghostly energy sealed the room and he couldn't get in.