Its hard to say really.
Some players play their arses off in their favoured position but really cannot grasp the play, style, positional, defence etc changes required in another position.
It's not a lack of heart or anything, sometime it's the attitude of "I don't really feel comfortable in what I'm doing, so if I don't do too much, it limits the amount of mistakes I cause the team"
In my opinion, this is what Moltzen is doing. He's much better running with the ball in hand, not receiving and trying to make something happen with the defence already on top of him.
He doesn't have the physique to do that.
And he's barely ever run a line or an angle before.
These things sum up to someone seemingly going missing on the field. Its simple stuff and blatantly obvious.
Ask yourself, how effective would Moltzen be running hard and straight off an inside ball at forwards?
He'd get smashed, everytime.
Everyone knows it, even him.
so why do it if theres no advantage to the team or himself etc?
This is why he's very quiet right now.
Sheens is an idiot for putting him in the threequarter line, you need defenders and strong ball runners back there. Moltzen is neither.