We're looking at Colwill as both a long term successor to Van Dijk and someone who can play the LCB role when Trent does his hybrid RB/DM move. Robbo and Kostas don't quite fit in that formation. I agree unless some miracle happens we need to replace Gomez; Konate can cover the RB/CB space when Trent steps forward, and maybe the view is that Gomez can deputise for him. I don't think Matip can do that role. Maybe whoever we want to cover for Konate isn't available yet. Or maybe we just don't want to sign that many players in one summer. But anyway, the Gomez/Colwill situations are two different things.