Acknowledging that what you have said here is widely viewed this way, I dont get this way of thinking.
It was only 2 years ago that a NSW centre combination absolutely pulverised QLD. So incredible was their impact that even QLD players admitted there wasnt much they could do to combat it.
If Sheens wants to play 'out of the box' footy, using his centres like the league world used to use them 15 years ago would be an intelligent start. How much impact did To'a have against Cowboys? They simply could not handle him and most of us gave him MOM. You could do far worse than challenge this ill considered belief that has festered in the game and make the centres the focus of our attack.
That thing about NSW's centres pulverising QLD proves that point though. It was two fullbacks who were picked there that were given a licence to roam around the field. The fact they weren't centres and didn't play like centres is what made them so effective.
That's not to say a centre can't impact a game, like To'a did for us against the Cows, but in terms of the hierarchy of positions it is definitely the least important. As long as your centre isn't a defensive liability and can catch and pass, they're fine. You don't want to be pouring a ton of money into your centres at the expense of your spine or forward pack...