Even without customs, ROB can leave a spinning top next to the edge when you're hanging on the ledge, forcing you to jump into his nair.
Definitely possible with the method in that video. Bowser is as good at trumping as anyone else, with the caveat that if he misses he'll be forced into a backwards up b recovery. See my edit in the last post, there's an easier method you can use, but it's slower. Basically a ledge canceled side b into ledge sweetspot. See the link I left in the previous post.
When he releases in "Spring," yes... Can't wait to "play" him, this "Spring."
Mewtwo in Melee wasn't high tier at all, I really hope they're more creative than redoing his Melee moves. How many characters need to charge orbs with their neutral b, warp with their up b, and have a crappy down b no one uses? Given how long it's taken, I hope they figured out something better.
Alright, we'll get this together soon then.