The few times I tried to get a multiply sired clutch with co-dom or dom males, I've been unsuccessful and have had the most recent male end up siring the whole clutch. However, I've seen plenty of posts of people getting multiply sired clutches. We know it does happen, but we cannot comment as to how commonly or easily it occurs.
In your case, since we do know that more than one male has been with the female, we cannot rule out the possibility, even when only one morph shows up, that the normals were sired by another male. So, you can only be certain that the normal appearing babies are 50% poss. het orange ghost.