I'd have Fox in regardless of whether he's used as a KPD or small/med defender. I don't need convincing. I'm just pointing out that Melican deserves his spot more than Francis, based on relevant form.Melican has been very effective as a lock down defender (I accept that it would've been unlikely for Arnold or others to do this role in better). Francis has been good at neutralising the aerial threat (just be great if he could catch). This has freed up the others (including Rampe) to focus on rebound.
McCartin can do what Melican does and takes more possessions. He just is a better player in that role. Fox is better one on one than Francis, has better hands and we can compensate for his shorter stature through McCartin and Blakey.