I agree that taking the X factor away from the lard arses makes sense but how would you go on to define someones deployability. More importantly why should someone be denied the extra that you would award those who deploy simply because he/she is posted to a type that is currently not in theatre.......................big can of worms me thinks.
Take X factor away from lard arses, see how suddenly people rush to become "fit" again.
Pay X factor to all who are fit and keep/improve the current Op allowance package.
Not rocket science but it will never ever happen