What players did we buy for Amorim's system? Everyone we bought was also fine to play in other systems, and indeed the only player we bought that was already playing that system previously was Cunha who actually performed better once we changed to 4231.
Actually Dorgu was probably bought because he seemed suited to the wingback role, so he's one. Everyone else seemed to be players that the club wanted to fill the roles we most needed, with the manager then expected to make it work. And even Dorgu is adaptable enough to play other positions now, which is actually what the club seems to be prioritising instead of getting specialists. I expect the same now, with Carrick having input into the decision making but ultimately it being the club deciding on the players.