People under estimate reynolds importance to the attack in that team. Not only is he the organiser, but he provides walker and Mitchell the room to do what they do.
For their deadly backline movements, reynolds will usually take the ball to the line first and throw dummies and feign a kick behind the line before sending it out the back to walker. These simple movements prevent the defensive line from rushing up (because they have to cover the short ball or kick behind the line) and subsequently gives walker a lot of time and space to work with.
It will be interesting to see how they go without him.