If we are going with Pearce and Ponga as our sole playmakers, meaning Watson will play at 5/8 as a ball runner, we may as well stack the right side with tacklebots to defend against most teams strong left attack.
With Pearce on the left, and Pongs overwhelmingly preferring the left, the ball won't see much time on the right. With Barnett on the right side I have noticed him taking the ball with a good opportunity on out wide but he tucks the ball and runs it instead. Both of them together out there and Ramien might as well put up a hammock in attack.
Personally, I'd rather a proper 5/8 to give us another side of the field to attack, another kicking option can't help either.
I've said this too, although I think we've got the tools we need currently and perhaps making use of our right side is more of a coaching point than the need for another player in the team. Pearce and Ponga definitely favour the left side although I think as time goes on and confidence grows, they'll use the right side more.