Cranky has the same issue with all non-Dee Kirby reps; no matter how potentially interested fans might be, the presumed next selection from the series (Dixie in DK's case, BWD in Kirby's) ends up sucking much of the oxygen in the room speculation wise. Get those two in Smash and both scenes would arguably be much more interesting in terms of discussion.
Honestly, that whole Bandana Dee quota has gotten quite irritating. I don't actually think as a frontrunner, he has a high shot of truly granting much on his own. If he's incorporated in his base format of completing the RtDL quartet, he will most likely end up with a somewhat disjointed spear user with a flavored moveset a la Meta Knight. But even Meta Knight has enough coverage across the games he shows up in to prove worthy, despite not technically having the highest attendance record. Bandana Dee has gotten virtually perfect attendance since RtDL struck gold, but... hardly any scope to cover for it. Ignoring the 3DS titles, where I'd argue he hindered other characters' appearances, the first game to actually give him some substance beyond 2011 was Forgotten Land. And even that's ridden with multiple (multiplayer) problems. Like I said, it just feels like he's incorporated as a means to fill the quota for the most popular Kirby title, which somewhat ignores any other semi-popular or recurring parts of titles that may be missing. Which applies to both theoretical inclusion and the home series' incorporation, BTW.
I must have said most of this before, but we've more than reached the 10-year threshold of this argument's strongest era. Keep in mind, I think Bandana Dee probably would've been perfect for Smash 4, especially given the time area and its philosophy. But because that didn't ever happen, more issues have cropped up, making it look like a much weaker argument than it must be. Yet nothing has changed. He still bottlenecks Kirby speculation, to the point of agony at this rate; yet the arguments and underlying flaws behind it have remained the same, possibly getting worse through time.
Maybe the issue could easily be mitigated by incorporating him as an option for a regular Waddle Dee fighter, who I'd argue has a much better logic behind an inclusion. But I guess that also assumes a lot for what the next Smash will do.