Looking at the list of leaked spirits I've noticed a couple of things.
First, a bunch of Link and Zelda incarnations. The fact that Alfonzo replaces Conductor Link regardless of which Link is on the screen would seem to point to the attitude that such a thing would be impossible in a scenario where Spirits deconfirm characters.
Second, and most important, is the existence of this
View attachment 179926 guy right here. This Spirit is called Pit (Original). Unlike the Links, unlike all of K. Rool's costumes and every other naysaying opinion we have to contend with regarding Spirits,
this is the exact same character as the Pit we have in the game. There's no alternate timeline stuff going on in the Kid Icarus universe--Pit is Pit.
This opens up an avenue where a character's original art, let's say for example an isometric render from the 90s,
can have its own Spirit alongside the modern design for a character with no conflicts.
From this point forward I don't want to see anyone saying Spirits deconfirm characters until the day they remove Pit from the game.