For posterity...
stingers 31'd me; all of his wins were Jigglypuff vs. me using ROB; my one win was when he switched to King Bowser and my ROB cleanly won. (Should give me tips to use Jigglypuff against him? Though if he were really trying he'd just use Aegis in bracket and win no matter what.)
No one used Bowser Jr. or any Koopaling.
stingers managed to beat Ermine by focusing on using Ridley. Duck Hunt's too challenging.
Next (this?) week (April 2223) I'll be putting my Smash action in the Nintendo-sponsored NintendoVS North American Open April 2022: https://battlefy.com/supersmashbros2022
(If you want more info or thoughts lemme know 'cause I moderate their Discord server; I also wrote my own explainer article at https://www.koopatv.org/2022/04/ssbu-nintendovs-nao-april-2022.html .)
For the best videogame commentary story on the Internet (sometimes featuring GameFAQs poll of the days and contest discussion) visit https://www.koopatv.org