OK, if that were true I'd agree but I don't see it that way.I think that argument doesn't hold up. Getting to the ball is irrelevant.
The part of law that I think would apply is "A direct free kick is awarded if a player commits any of the following offences:..
• impedes an opponent with contact."
I thought Ederson arrived late and collided with Fraser after Fraser had turned to follow Cancelo. I think that it would be a fair interpretation that Ederson impeded Fraser by doing so, prevented him having a chance to get to the ball, and that it was a foul.
Presumably, the ref decided that either it was a 50/50 collision, or that they were too far from the ball for there to be any meaningful impeding (I think it fair to assume that the chance of interfering is considered).
First a question - in the absence of the ball how do you decide who arrives late?
Secondly I don't see any evidence that Fraser has turned to follow Cancello despite having moved about 2-3yds after Cancello first plays the ball.
Thirdly the ball has moved further away from Fraser and Cancello is moving with it having both a head start and the momentum so that Fraser's chances of getting the ball are pretty slim.