I think king is a better prospect on the wing but as for fullback , I think matty will make this position his own in next couple of seasons

I certainly feel Tomkins should go back to Stand off 'long term' because thats a position truely great players play in more so then fullback and I think he'd shone with the extra responsibility.

In terms of an ideal plan going forward-

Short term- Sam stays at fullback for the majority of 2012 especially in the big games but Russell gets plenty of gametime under his belt on the wing and at fullback in some lesser games.

Long term- When Leuluai leaves i'd be looking to push Sam back up in to the 6 position with Russell taking over the fullback berth on a fulltime basis.

Like I say this is in an ideal world but it's a real prospect imo.