He was not bad but Sevilla playing so much different game than us very hard to compare. Of course against Bayern they are even more defensive than usuall but their normal game is nothing like City's.
We only will see Kounde when he is put in a defence that spends 90% of game at halfway line, gets zero protection and opponent puts balls behind the defence and they need to hold perfect offside line and react within nanoseconds. And also any misplaced pass can end in a quick counter where Ederson rarely can make a save and its a goal like 90% of the time.
Same goes for Koulibaly too.
to me Diego looked the much more dominant, stronger CB there, Kounde needs to be controlled/directed imo, possibly Laporte will be able to do that. KK is different, he is ready made experienced CB, he would maybe even lead the backline instead of Laporte at times.