Any pressure put on the defense is nullified by Lucas's clever movement. It's incredible the amount of times he is available for his teammates. And when marked his runs remove the the congestion allowing another player to receive the ball.
Add to that players are getting no where neat him when he is on the ball. If you mark him man to man, his runs open up the game for his team and if you back off him he finds that pass right into th feet of the danger man on the edge of the box. Rush him and he will just give and go, simple ball simple run, make space, receive give.
Neymar is the blade but Lucas is the wielder. Running the game at the minute.