The best full backs in the world aren't really judged when they are played on the opposite side because they rarely play there, which was my point as you had originally said today was the reason why Dalot shouldn't regarded as one of the league's best at RB.
As for the tackle and the criticism of Dalot, I don't disagree as he was horrendous in the first half. It also happened last year at Stamford Bridge where had a good game up until the point of that penalty against Palmer again at LB. It's not a coincidence that your body shape is wrong and unnatural against tricky players; I'm not excusing it as it was rash but there's some sympathy there. I just don't think you should conflate his performances at LB, where he has been generally good to his quality as a RB. His versatility is also giving him a wider berth of criticism simply because he's available and can do a decent job.
Whilst Mazroui has been good, I'd still give the RB back to Dalot as he has more running power with no loss of defensive awareness and technique on the ball. Although it was the end of the game and against 10 men, the assist was an example of that composure. When or if everybody is fit, Shaw probably edges there but there's merely because he has quality on the ball (but seldom seen) and is used to playing that side. Off the ball, attitude and general performances, he's neither here or there for me.