It was 4-4-2 defending, which is why I say Royal was playing RB and not RCB.It was fluid, as is the fashion.
In possession Romero was in the centre of our three CBs, Porro and Davies pushing on. When we defended then Emerson came across to help Porro with Zaha and Davies tucked in on the other side to make the 4.
Yes, in buildup it was 3-2-5, but as I've said, there are times that Hojbjerg will play that role and nobody would say he's playing a CB position.
Defensively, nobody who watched the game can say Royal was playing a CB role.