Oledski has done a big stint in the toughest position this year; I think he was making less impact recently and probably did need a rest. Having said that I’d have him in the team over one or two other props.
Ferres... I don’t particularly rate the version we have now; BUT he is a physical thing in the middle and brings some aggression, both attributes the team lacks at times.
I’m not saying I would personally pick him but I can see why they are.