Wicks hasn't shown any ability to run through the mids at this stage.
And Fox doesn't really strike me as a shut-down type either.
We had Clamps, and prior to that we had George. I'm just not sure who we have now.
Clamps mainly did it to the opposition half backs from memory. I can't recall him playing a defensive role on opposition mids. Hence the Wicks or fox, I don't think we'll go with anyone specific considering our depth.
Fox playing in defence predominantly would mean his skills should translate well to do that role in the fwd line imo.