Teams do double or sometimes triple up on him but only when he gets the ball, there's never 2 players just following him about all game though so the space is reliant on Adama identifying and picking a pass out that punishes this. If he did that, teams wouldn't double him but he's just not that sort of player, to quote an NFL phrase 'the are selling out to stop the run' because they know space for others isn't going to hurt them with him on the ball.
Tbf to him, he does often beat all 3 but then is usually forced into a low % cross or shot because of the position he's in. He was infinitely better when he played on the shoulder the first few games, I was even optimistic he'd get a decent goal return but he's regressed back to doing what he used to do and unless Raul is at his peak those crosses just won't be fruitful.