Alright, so, I saw this but I can't help but think about how strange this post is. For starters, yes, fan demand got Sans and Cuphead in as "deluxe costumes" (I'm assuming we're just calling any costume that completely covers the mii's body and head "deluxe" now) but you need to consider the fact that their are clear principles to these costume choices.
Firstly, Sans and Cuphead are really popular in regards to gaming in general, not just Smash specifically. The same could, arguably, be applied to any of those three you mentioned, sure. However, you're forgetting the big difference between the reasons they're deluxe and K. Rool, Isabelle, Chrom, and Inkling were upgraded:
Let's make a pool here for easier comparison.
[All Costumes in 4; became full fighters]
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[Almost all 7 have been around for years to even decades longer than Sans and Cuphead have and have leagues more fans and demands in Smash specifically due to their longevity, all have had mii costumes in Smash prior to Ultimate]
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Geno, Lloyd Irving, Monster Hunter
[All costumes in Smash 4; costumes are MIA]
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[All 5 of them are third party characters and aren't playable yet]
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Sans, Cuphead
[Both are indie properties, never had a costume or anything to do with Smash prior to Ultimate]
See what I mean? Yes, Sans and Cuphead have some popularity but when you compare them to Geno, Lloyd, and Monster Hunter, they just don't hold a candle to how long and frequently these guys have been asked for.
On the topic of costumes, I'll openly say that in terms of longevity, Inkling just doesn't have it because they came out in 2015 alongside Sans. However, consider how their inclusion was a guarantee, regardless of popularity in Smash because their series was a huge success for a questionable console. That, however, doesn't change that this:
Smash 4 Costume's Game Release:
(2012)
(2012)
(1994)
(2015)
Geno (1996)
Lloyd (2003)
Monster Hunter (2004)
"Deluxe" Costume's Game Release:
Sans (2015)
Cuphead (2017)
"Deluxe" costume candidates just don't have that same longtime popularity and request factor these other ones have. Heck, you could even argue that the rumored Knight and Kris costumes Fatman mentioned could be deluxe costumes because they fall more in line character-wise to Sans and Cuphead as indies who are pretty recent characters with no prior history with Smash before Ultimate.
That's just my cup of tea on the whole thing.
{P.S.} Lloyd wouldn't work as "deluxe" because of fans' rules on what forms a "deluxe" costume. It's any costume that fully covers a mii's body and comes with a music track, right? I wonder why no one ever mentions the fact that, technically, that's literally Black Knight's costume (covers entire Mii and could be argued to have come with "Against the Black Knight"). He'd be more akin to an Isaac costume, unless you just meant it'd be a costume that came with a music track.
{P.P.S.} I highly doubt they're going to do yet another "deluxe" gunner for the third time in a row.