He's still only 21, had an underwhelming loan last season and has been finding his feet this.
Don't forget it took Alexis a season to break into the first team.
Let's not wright him off just yet.
According to Pat Nevin, who works for Chelsea TV, so he saw a lot of Billy previously.
Talking about a game for Scotland v Denmark,
Nevin explained (BBC): “Billy plays in the Jorginho position – he sits in front of the defence and he controls it. It is like clockwork the way he passes it and...
Yesterday according to sofascore.com in 57 minutes he attempted 5 ground duels and won zero.
Caicedo, in 33 minutes, attempted 6, winning 4.
Perhaps it's just a confidence thing, but it's just not happening for Billy at present.