It was debatable but not any more
Not just about him but the team, we need him in the backline, that's where he does the most damage
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It's because he doesn't currently have the physicality to be FT mid and stay damaging.
He is best off HB because he can use his smarts, endurance and pace to work past and recieve it.
Tom Mitchell is not at the level to feed Nick on the outside nor are our rucks consistent enough to palm down to him on the move from center clearances.
We also as a side do not a have a player capable as Nick off HB to generate the turn over drive we need.