Midfielders today can't just play one , just like key forwards learn to play down back b4 going up to be the main focus @ FF/CHF . Did you see Mathews play footy Jay-Z?......he was a rover against Cable but ended his career at FF. Kicking 700 goals. My argument is that players can't afford to be keyholed they need to have some flexibility into their game. Like Ive said I prefer him 70% forward and about 30 % in the centre for crucial ball ups. I reckon its great the Scotty is prepared to mix it up bait , I mean we've all been guilty bemoaning that he won't switch to plan B or C if plan A doesn't work out well.
I think a team can afford to carry SOME midfielders who are just midfielders (think Judd, Priddis, Swallow, Pendlebury, Rockliff) but some of your midfielders need to have the flexibility to rest somewhere other than the bench and we have that in guys like Ziebell, Cunners, Bastinac... even Greenwood.
Playing Ziebell 70% forward and 30% midfield makes him Leigh Adams Mach II and Ziebell is a much better midfielder than Patch so I see no reason why we should do this. Also, we have a number of forwards (Black, Petrie, Thomas) who can't play anywhere else (Brown pinch hits in the ruck but is also down there most of the time) so having a guy like Ziebs (who can play majority midfield) play the majority of the game in the forward line actually decreases our flexibility! That would mean we have 5 players playing at least 70% of the game in the forward line leaving us 1 (or none is playing Hansen spare) spots to rotate other midfielders through the forward line for a rest

