The ball he slipped into the box for Valencia sums it up, really. He gets the ball and holds it for ages because Valencia is incapable of moving in from the flank. As soon as the run comes - about five seconds too late - Kagawa pokes the ball through and Valencia is in a dangerous position.
If all of our players could make those runs instinctively instead of Kagawa basically having to tell them five times where he wants them to move our play would become so much quicker. No-one else in our team has the ability to receive a pass, turn on the ball and release it as quickly as Kagawa does, but he needs to have players making those runs to get the most out of him. Januzaj knows where to run and our play looked really good down the left. Valencia is crap and we just stopped using the right altogether. If the team can work on making the movement more fluent and Kagawa gets a couple of games (and hopefully a goal or two) to build his confidence and get back to where he was last season, we could actually start to look like a decent side on a consistent basis.