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Peter Sullivan (51)
Given a probable starting combination of JOC (James O'Connor), To'omua, Paisami and Wright can cover multiple positions, I think Petaia is an ideal 23. He provides cover across a couple of positions and also gives the x-factor off the bench.
The concept of an "X" factor off the bench has always baffled me, it is almost an admission that the starting team is expected to be behind at the end of a game and that the game plan is not good enough to win unless you stop following it.
I would rather plan to be ahead and have replacements that can hold their own without being unconventional or relying on a single act of brilliance to win a game. This is why I would prefer a player like Hodge, Jock Campbell or Hamish Stewart off the bench than Petaia.