During the movie, we learn that if either Gabriel Yulaw or Gabe Law dies, the other will become 'The One', which is why when Roedecker and Funsch decided to split into two, one would kill Yulaw, whilst the other would get ready to finish Gabe Law.
Roedecker: (with a small bomb in his hand) When the green light [of your watch] turns red and stays steady, and Yulaw is dead-...
Funsch: And you.
Roedecker: You know what to do.
Funsch: (loads his handgun) Not a problem.
Yulaw also used that knowledge to convince Roedecker and Funsch not to kill him during the hospital attack.
Yulaw: (with two guns pointed at him) We all know, if you kill me, you have to kill the other guy.
From the very beginning of the movie to the end, the objective of the MVA (Multiverse Authority) is to catch and send Yulaw to the Hades Universe (which they succeeded, thanks to Gabe's help).
However, on the end, following his fight against Gabe, Yulaw was fairly weakened. And when he was sent to the Hades Universe, a horde of hundreds (if not thousands) of people started rushing him for a seemingly long (if not endless) fight.
Doesn't it mean that they sent him to his death, despite knowing that he was the last one aside Gabe Law? If he does die swarmed by the Hades people, Gabe Law is going to become The One. Even if we consider that he's a reasonable person, that's not a reasonable thing to do.
