Hmm that could be the case but I’m not entirely convinced, if it’s not too much trouble could you sight any sources for the Chewie brwl being part of Lord and Miller’s cut? I remember hearing an interview with Jonathan Kasdan where he talks about writing that scene.
The Kasdans were writers on the film, and were not allowed to direct. Howard was the other director who shot 80% of the film, the other 20% is from Lord & Miller’s original version of the film.
Also, Lord & Miller are more prolific producers than they are writers. Some of fans’ favourites of their work they did not direct (such as Spider-Man: Into the Spider-Verse). It’s important to separate what they directed from what they didn’t, especially when talking about what their direction would have looked like.