Super Mario Boards

It is? Where? Checked but didn't see.

ssbwiki.com/DLC_Spirits_(mode)
ssbwiki.com/King_K._Rool_(SSBU)#As_the_main_opponent

Don't know... could be.

Out of curiosity, since you obviously love Smash, have you read World of Plight?

It's a story about Smash I'm writing for The 'Shroom. Here's a link, if you haven't read it.

OK, so, images were found by the twitter user PushDustIn (who also archived some of Sakurai's unannounced statements), but no source of those images was found. Strange.

So, they were found but not confirmed?