but if psyphon appears in an episode like here is the list
from the trailer of the new season it shows psyphon, im pretty sure he's a villian they'll use a couple of times. and the reds are just robot drones there not really that important. so it dosent matter if they show up or not.
Just because Psyphon might return (and I see no reason for him not to) doesn't mean he'll bring the REDs with him. When Vilgax returned did he have his sword? Nope.