Sorry for the late response, life's been messy, but thanks!
- I tried as hard as possible to do that, but I felt fusion evolutions should be the same either way.
- It wasn't a mistake, it was just because of the map. He fits better in that region and Mugendramon fits better the sewers (which I wanted to be right before the factory, the final level). Also, Mugendramon is a recurring villain fusing with Chimeramon to become Millenniumon, so I also wanted to recognize his status.
- It's the first time someone bring that up like that and I totally agree! I just didn't think about that, sorry!