I don't think there is a bad thing to see for patterns, or try to formulate theories in teh sense that you are trying to understand teh criteria of selection between nintendo and sakurai...
For example, it's a pretty common theory that this pass will be all third parties from new franchises... this theory have been speculated since joker reveal and so far seems to be spot on. plus we have soem confirmation from sakurai himself and the like... still it could be proven wrong with the fifth being Edelgard, or a rythm heaven rep, but there is little to think otherwise.
Obviously there is some logic and criteria when choosing characters, the don't simply "roll teh dice" and even if they did, there was a selection criteria for the roll possibilities beforehand.
That being said... a lot of this theories are, with due respect, Utter nonsense...
Like they would limit their selection only for characters that have partners? or thinking that the character color is a decisive factor? yeah.. it's true that there might be some true in the color theory in teh sense that they likely will choose a variety of characters to appeal to a wide array, and therefore selecting diverse characters (Instead of say, a pss with doomguy, master chief, Markus form gear of wars, a soldier for call of duty and the guy for fornite) But stuff like teh character colour, or which colour goes well as a background is stuff that is usually bend for your selection, and not teh other way around. It can provide a "hint" but bet on it and you are going to find that they are as free to take liberties as the next guy.
BTW, i still think that my theory, the "pants theory" is sound as to all teh characters on this pass will be wearing "pants"... so i'm sorry dixie fans /s
Okay, how about this, if Dracula is in the game, can Geralt of Rivia be in the game?
as much as I want Geralt in the game, he is still in there with Goku. There isn't any dracula inteh game, but specifically the Dracula that originated in teh castlevania series.
Geralt would still be Geralt from the witcher series, a series of damn fine books turned into damn fine videogames.