It's much more likely all 4 are left off the roster than Cuevas being placed on it.
If Cora goes with an 8-man bullpen, Kimbrel, Brasier, Wright, Kelly, Workman, Velasquez, ERod, and Barnes is a likely set. Johnson and/or Poyner might eliminate someone from that list. Cuevas is a few injuries away from entering the conversation...