Tough FLEX Decision STANDARD

I am choosing between Mostert, ROJO, or Ballage.

Right now I want to play Mostert just out of the excitement he could be back…
But I think the right decision should be ROJO or Ballage.

ROJO is a liability but the ceiling is so high but gamescript could be bad
Ballage floor is pretty low compared to his last three games and has a great matchup.

What do you guys think?