Yep, the ideal scenario for us is Harris playing on the 3rd tall/medium forward, love him playing the intercepting role, also Jack Payne is improving every week and taking his share of intercepts as well.I think Gunston can't do what Joyce and Payne can cover in their roles. He's a bit short and leaner build as well, so I doubt he can play close checking defender on a gorilla forward. Playing Gunston in back line means we have to change Andrews to lockdown role and let Gunston be that intercepting third defender potentially.
It's worth exploring as a fall back option but it'll disrupt what we've found as a working combination now. Andrews roaming free seems to be the best option so far.