Lochie my friend sometimes the good is the enemy of success.
No I'm not saying Boof is Bad. BUT he will never, ever, ever, ever be a GREAT Front Rower. He does a good job, but to be a premiership winning team you need your players (and your Props especially) to do a GREAT job. Sometimes when things are going good you fool yourself and don't make the changes you need to to become the best you can.
Boof may become a GREAT back rower, but will never be more than a good Front Rower. Therefore back row is where he should play, and Sheens should be looking to develop and/or recruit the next group of Great Props, not waste a potentially great back rower up front.
Do you see a Joel Clinton anywhere in the Wests Tigers organisation? I don't.