KD has declined hugely from an athletic perspective since his injuries is the thing. He can't beat anyone off the dribble at all anymore. But KD was so dominant that there were many steps he could lose and still be great.
Lauri's defense is very very very sketchy and borderline and losing one or two steps makes him far less valuable. He was one of the worst defenders in the league last year and had very little value because of that. But he was league average on defense in 2022-2023 and 2023-2024 and he needs to reach that level again to be a valuable player.
We saw Lauri after losing 1-2 steps last year and he wasn't very good. Hopefully he can return to his 2022-2024 form for the next couple of years, but this is not a guy who is going to age great at all.