I completely agree with the fact that witts and Grundy won't work together, but the issue is that at the start of next season, the afl has suggested that the Sub-rule will be gone. So the convential 2 ruckman will be needed or the pinch-hitter( Leigh brown, tippet, lynch). Now, we probably won't play White in the afl team ever again- barring injury.
If we trade Witts, we have nobody to pontenially take the secondary ruck position. Cox won't be ready till 2017. And Moore is too young to shoulder the 2nd ruck duties with his fragile frame.
If we trade Witts, it would have to be for a first rounder that we either on-trade/draft for a KPF.
Ideally, trading witts to Sydney for Sam Reid might be good. Or even just chasing weidman. But either way next year, we are gonna have to need a secondary ruckman. Hopefully, he's a decent KPF and that will allow Reid to go back.