I definitely see a need for a big ball runner in the back row. It could be the 8 or it could be the blindside, doesn't matter, so long as the other bases are covered. I do have a preference for the pack's perpetual motion machine being at eight though. Ideally, IMHO, you want them to be able to carry the ball up consistently in attack, offload in contact, provide cover in defence, support the ball carrier and be a line out option. Higgers could be that guy and McCalman mostly does it. Cliffy is a different player in that he works in close quarters and not in the wider channels. Then again Hooper does more of the ball running for the Tahs and therefore it works in their structure.
I think if we're going to have Pocock at 7, Fardy at 6 I'd like Higgers or McCalman at 8 to balance it out. If Hooper plays 7, I like Jones at 6 and Cliffy at 8.