I might be inclined to try something radical, like:
Robson
Umaga
Fekitoa
Odogwu
Bassett
Kibirige
Minozzi
And on the bench
Porter
de Jongh
Sopoaga
Can you imagine how a team might want to line up its defense against that lot? If they try to double team Umaga with backs, and he shifts it to Fekitoa, you are going to want two or 3 backs on him, but if he commits them and shifts it to Odogwu, then how many more will you need there? Which would leave Bassett and Kibirige to do what they do best and motor down the outside.
It would force a team into a fast flat defence full of backs and back rowers, meaning there will be the space directly behind them for Umaga to dink over and in to. If the full back covers this, then a deep kick would go over him.
And would you want to kick for defense or attack knowing you could be giving it to any of these backs of ours?