I think that the injury is being overplayed.
The injury took place a long time ago and Shaw will have definitely got over this. For someone to make it at this level requires a degree of mental strength, which Shaw has. He is not as weak some people are making out.
The issue right now, is his weight. If he lost a lot of weight, I am positive we'd see more energy and aggression.
In 2019, you can't be expected to compete/run against lighter athletes, while carrying an extra 10KG. Being at your lightest weight is very important when it comes to competing in a sport, which relies on you running for 90 minutes.
But, what I will say is that Luke Shaw is not the reason why we are in 8th place. Woodward, the board, no DoF, Ole, the coaches, the scouts, the fitness/sports doctors - all these people need to be looked at before Luke Shaw.