Yes sir. Stan Winston's Predator crew was a small team, with only one character actor (Kevin Peter Hall) and one person of Kevin Peter Hall's stature. For a full film I would believe they would have to consider alternates, but their Predator work was considered "reshoots" with only 2-3 weeks originally designated I recall. Stan celebrated Kevin too, that he never had to lose a shot in those "Predator" reshoots because Kevin couldn't handle it anymore. Not one shot lost. KPH is just a legend.
But the red FX suits, yeah, it's also my understanding as well that some stunt guys wore some red suits, but I've never found the precise people named in text or credits.