I’m pretty sure I remember Lorenzo Bonaventura (our fitness coach) did a speech at a conference for coaches and he said that during the Covid season they decided that bringing players back as subs doesn’t actually help, and they’re more likely to get injured because no one ever warms up right and the game is at full pace when they go in. Instead they started bringing people back from injury as starters and because they can live monitor all the players’ HR and GPS data they know at all times which players are tired and who can last 90 by how fast they’re running, how high their HR is and how much they recover during breaks in play.
So that’ll be why Kev played 90, it’s their preferred method of bringing people back and they could see he wasn’t tiring badly.
I’ll try to dig out the video, IIRC it was in Spanish with subtitles.