Tonga can play just as well either side. He played on the right side in Origin last year for the second game and spent most of the latter part on the season on the right as well.
We only have 1 option.
Inglis and Tonga on the left;
Inglis is the best attacking left centre in the game with average defence.
Tonga is one of the best defensive left centres in the game.
Folau and Tate on the right;
Folau is good to kick too and is big and black.
Tate is the best defensive right centre in the NRL.
Inglis and TOnga will obviously swap in attack and defence.
I like Tate as a winger better to be honest. But he does a fine job at center defencivly, especially for Qld a couple years back.
I think Scott Bolton is a chance at being a shock inclusion in the starting side, he is playing that well.