Let me warn you about patterns.
I was proclaiming that we'd get Isaac, Geno, and whatever other big requests remained after Daisy, Ridley, King K. Rool, and Simon. Geno especially would've fit the pattern the best as one of the characters who has been requested for over a decade, but would finally get his chance alongside so many others.
Then we got Isabelle, Ken, and Incineroar. Anything can happen now.
The only thing we can have faith in is that DLC characters need to be big and popular enough to sell on their own, as well as be suitable for a complete package with a stage and music. Isabelle/Ken/Incineroar wouldn't sell as DLC characters, but can be sold in the bundle with the other newcomers that brought more hype. At least Joker put to death the idiotic idea that all these DLC characters would be corporate promotions meant to advertise other games primarily. So you're right in saying that there's less reason that this pattern would break.
However, it's still entirely possible we can get someone that doesn't fit that mold and everyone goes "Really?" Corrin being one of the last DLC characters is another example. You had a pattern of Ryu, Cloud, and Bayonetta, but then Corrin's in there, too.