To be fair, the other Capcom IPs technically aren't used yet outside of SF, Mega Man and, to a small extent, Monster Hunter. As far as third parties heavily invested in Smash go, the focus is mainly towards series that already have their characters in, so in their case it makes sense why much of the rest of their repertoire isn't around for the time being. So this way, there's no need for me to be angry at Konami for passing over Master Higgins and Bonk for no reason at all like in Super Bomberman R.
Your line of thinking about YCB is hilarious tho, I love it.