Brown is a winger, safe under the high ball, a decent finisher and knows how to find the line.
Lafai is a centre, has brilliant footwork and speed to burn IF he gets in the open.
Two completely different players though.
I don't see Lafai being anywhere near as effective as a winger, whereas Brown is already a winger and proving himself.
It all depends where Inu slots back in.
If Inu returns in the centres, I'd expect Brown to stay on the wing.
If Inu returns on the wing, I'd expect Lafai to stay in the centres.
Lafai's dominant step makes him tricky to play as a winger, as unless him and Perrett swap, Lafai is stepping towards the sideline.