How is he a better passer than Toby? What proof is there to quantify this? As far as I can tell, there is nothing to show accurately the proportion of short vs long passes and what dictates what an accurate pass is. So where are you getting that stat from? If you say it's an eye test I'm afraid you and I can no longer talk to each other.
And if we're using Toby as a comparison, he was a fucking magnificent defender. Dire is not. He's arguably not even a defender at all, let alone a good one.
By default. Mourinho inherrited a team with ageing Toby and Jan at the back. At the start of the 20/21 season Vertonghen was released. Toby was sold the following year.
Dire is there by default not because of merit.