I found what my first video is about. I have zero idea how I missed this for so long, but I found a beastly ledgeguarding option, his standard side b.
Now if the opponent doesn't have to cry in fear of your Bair and Dair (and maybe standard up b's spike) you just gave them even MORE reason to sit and be VERY afraid off stage.
With proper timing if you side b near the ledge, instead of sweet spotting the ledge you'll spin a whole bunch of times THEN grab the ledge, staying in the same place in the air. This means you're leaving out a VERY long lasting hitbox that can send people behind and away from you off stage, which can set up into Bair and Dair while GIVING YOU YOUR JUMP BACK IF IT HITS!
Now if this wasn't nice enough, there are several different timings on this. One will just put out the hitbox for a tiny bit and then sweetspot the ledge, one will hover near the ledge before popping you back onto the stage, and the last will put you significantly under the ledge before sticky hands bring you back to grab. Did I mention it can still register to hit both below AND above the stage for all of these versions?
Basically a simple TLDR, you can cover every single option at the ledge while putting out a strong killing hitbbox that can also combo into death moves at low percents. Even f the opponent is at low percents so long as you get them offstage you can set up a mind game and trap with this, if they recover high they're punished, if they recover low to try and avoid it you just hold a tiny bit longer and get they hit in. It's SUCH an amazing tool that abuses how the ledges work in this game (1 frame is available before people grab the ledge, and this keeps the hitbox out so there's no way to miss the window) and I feel like an absolute moron for missing it this long. It also seems to beat out a lot of the recovery moves I've tested thus far, even those with hitboxes so you can use it to eat them out as well.
Able to basically make it so once you are offstage you are doomed, Mii Swordfighter. ADVANCING THE META!!!