Delays are not bad guys, if it happens. A delayed game is eventually good, a rushed game is forever bad.
Besides, wayforward has a panel there, they could still discuss stuff. By show off they could mean a demo or something, but in a panel they could go into some details, maybe on production, or show some screenshots or sketches.
As for that twitter thread, i basically have a good idea what i'll say. I think i need to put in a bunch of stuff debunking peoples ideas on her not being in. Wjat i will say wont 100% disprove those theories but it will show there is not a single thing 100% disconfirming her as being a possible dlc like some people think. Nothing saod or shown from nintendo, wayforward, or anywhere else removes her 100%.
As for people saying other indies have a better shot, honestly the only one i feel has a good chance like shantae is Reimu. Every other indie, even ones i like, are either way too new, have only 2 or have less games under their belt, which i think are big nocks against them for smash, at least playable.