I’m beginning to question the Quality Assurance team idea due to stuff like this:
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While yes, they're basically the same generic enemies with some accessories/different outfits, if you think about it, some past characters such as Goombario, Koops and Kooper aren't much different albeit they were made more unique (and koopas in PM64 did get some unique facial shapes and colors, and Goombario had unique teeth), so idk, maybe it is just Tanabe and maybe Miyamoto being hard on them for some dumb reason? Maybe Waluigi not appearing outside of spinoffs is just due to a lack of ideas for a good game to use him in, a fear of risks, or a general lack of ideas for how he could appear and make sense in any mainline game?
But if the insider dude knew his stuff, being a credible person, then maybe it's true...idk. Maybe it doesn't matter, since even if it's not a whole team it's probably still Miyamoto at least, just giving the main Mario team and Smash Bros. more freedom...heck, sucks we don't even get these characters in the sports/party/kart spinoffs...
And, maybe these aren't really as comparable to Kooper and Koops, idk...Kooper does have a unique color, and Koops has a very unique outfit and stuff, and of course, there were still plenty of unique Toad-based characters and others, so...