I took the liberty of changing the acronym words a little bit:
Brawl
Spring
Bug
Stance. This way we can incorporate "stance" into the abbreviation and just call it simply BSBS, which is exactly what it is. And it adds subtlety to it, making it more passive-agressive.. lol
I thought it was going to be with regards to profanity; but, now that you had it going for a bit, I'm just going to refer to it as such unless I know the person I'd be talking to about it won't get offended.
I think the BSBS is a assest import bug ... They take a lot of assest from brawl and maybe the BSBS is a bug because some Brawl assest (here the double jump count /w SpinDash ) is buggy with Smash 4 engine ?
They could have carbon-copied Sonic's data from the previous game and called it a day.
But, no. Instead, we have this. For the better; ultimately, however, this new jump data retention (or lack thereof) is irritating as all Hell and I can only speculate as how they screwed it up this bad.
Like, you have no idea how much I miss ASCSC. I know that it probably wasn't intended for Sonic to be able to land into a shield when few other characters had such access; but, that was that something that was appreciable. This new "I haven't used my 2nd jump but because I used Spin Dash in the Air I'm not allowed to jump-cancel the SDJ" thing is complete horse crap and I sincerely wish it would get patched... except I won't get my hopes up because then that means other things might change, and not necessarily to
help Sonic.