Who will be left out? (spoilers)

Isnt the theory that Siegfried (or whatever name they go with) will betray humanity? In the legends he is Brunnhildes lover and some gods already hinted at a more important connection between the two.

@Comander-07 siegfried is not a participant at all though so what he does is irrelevant, the most unkikely to participate at the moment is nostradamus because brunhilde said she prefers not to use him and also she brought buddha over so that goll would not participate (because buddha does not need a valkyrie), and it seems that goll has been paired with nostradamus as his valkyrie

It's more likely that there is going to be an extra god fighter and a tie round.
I think that the tie round is going to be brun (and whoever she fights with) Vs odin, we already know that brun is going to die (by the chapters between R4 and R5) and odin surely cannot be left alive, this will cause goll to join to fight and it makes sense considering all the character development she has had in the last fights.
About the extra god, i think it's either Siegfried or Hermes.

@Brunilde brunhilde is the main character she is very unlikely to die, she is as much likely as itadori from jujutsu kaisen who was supposedly destined to from the start, and the "draw" trope was used with okita vs susanoo, and it was shown that the winner still gets healed even if they are dying, only way for an actual draw to happen is if they both die at exactly the same second which is unlikely

from the remaining 3 valkyries, the unkown one (number 8) will be used in round 12, and then brunhilde will participate in the final round 13 againt odin (and not sure which fighter but most likely kintoki because he is the japanese national hero so the author would want him for the final victory)