I'm not sure what stats you are looking at?
https://www.nba.com/stats/team/1610612737/onoffcourt-summary/?sort=DIFF_NET_RATING&dir=1
https://www.pivotanalysis.com/post/net-rating
It looks to me that of the players playing major minutes for the Hawks:
Kevin is the net leader in Net rating (Offense -defense) at +7.4
Isn't that what we should be looking at?
Because I am seeing different than you on the court. I think that Trae's defense is poor, but Kevin's is actually pretty respectable, especially when he isn't logging 35+ minutes a game. I'm just curious why you think Kevin is a shit defender.
I think Kevin's a poor rebounder, but his defense is usually pretty solid in the team scheme.