I think we all know it would be a yellow (if that, judging by the reaction of the earlier knee-high challenge in Aguero)... but that shouldn’t be the standard.
I can’t really complain about the red as it was on the wrong side of borderline for me.
What I will complain about (until Taylor is canned or jailed) is the inconsistency in what is and isn’t a red card offence. And there is an argument to be made that Delph’s poor challenge would have never occurred had their player been rightly sent off earlier in the match.