Herrera is a good central midfielder, Kanté is the best ball winner in the league by a country mile. Sorry, but the distance between Herrera and Kanté is huge, especially defensively. Herrera is a good central midfielder and criminally underrated by many but he's nowhere near Kanté. Which is more of a compliment to Kanté than anything else.
Kante gets all the plaudits but it's not as cut and dry as you are trying to make it seem here. The gap between their abilities isn't "huge".
Herrera has actually been a bit of a revelation (defensively speaking) under Mourinho.
Some relevant stats someone posted on another forum earlier today...

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