Thanks to Mauss for the Opta stats link. I couldn't be fucked working much this morning so had a bit of a play. Interesting numbers. I had a look at the AB loosie candidates plus a couple and some Aussies. From most to least:
Attacking rucks/minute: EB, DP, Withy, LJ, Kirifi, Parker, Grace, Segner, Tizzano, Lakai, McReight, Lio-Willie, Valetini, Finau, Savea, Sotutu, Wilson.
Carries/min: Valetini, Wilson, Savea, Sotutu, Lio-Willie, LJ, Tizzano, EB, Kirifi, Grace, Parker, Withy, Finau, McReight, Segner, DP.
Tackles/min: EB, Wilson, McReight, DP, Grace, Tizzano, Kirifi, Withy, Lakai, LJ, Lio-Willie, Segner, Parker, Savea, Sotutu, Finau, Valetini.
Defensive rucks/minute: Savea, Kirifi, Withy, DP, McReight, Tizzano, EB, Lakai, Segner, Sotutu, Valetini, Grace, LJ, Lio-Willie, Finau, Parker, Wilson.
Adding them all up, for a loose 'ínvolvements/min': EB (and it's not close), DP, Kirifi, Withy, Tizzano, Lakai, McReight, Savea, LJ, Grace, Lio-willie, Wilson, Segner, Valetini, Parker, Sotutu, Finau.
Stats never tell the whole story, but interesting nonetheless.
One clear variable is actual position. The No. 8s are at end of list and open side flanks at beginning.