Why it has to be a solo goal? Partners created many opportunities for him to score. You asked what can Kagawa do, presumably to look good and influence the result, if teammates missing his chances. I replied he could at least score the ones that were created for him.
Well my point was close to it. I don't know what you think number 10 should do on the field, for me that is a person who must, not should or can, but must contribute goals, via assists or scoring. Or create shooting chances as a sort of the lesser alternative to assists. That's their primary role and job on the field. Now other players like CMs, DMs can make lots of short passes, control the game flow, win the ball back, create overloads in certain areas, open up space for teammates to run into etc. The number 10 is the cutting edge of the team so to speak. A number 10 that is not creating chances and scoring goals is useless in my opinion. Just look at James Rodriguez from Colombia, he does not run around the field passing it sideways, no he leads the charge as any number 10 should.