Caliafori was a much bigger talent and Italy's best player in the World Cup.
Kerkez yes 2/3rds of that fee which is broadly my point. 30m EUR is a lot for a player who is actually pretty raw.
Malacia was half that, Barco's quality looked great and he was 10m EUR, we'll see how he does when he returns from loan.
If the argument is that its because it's January then fine. But that doesnt make it relatively low cost. We are overpaying to get a player with very limited experience in January rather than at end-of-season where his true value will be reflected in the transfer fee.
Romano said himself that it would take a big offer to make him leave in January - in other words we'd have to pay over the odds.
You can compare across other full backs who are at a similar bracket of quality though, and still come to the same conclusion.