Team cohesion is very important, along with team communication. If you're going to speed hours upon hours of dedication and time to a team, you should enjoy who you're doing it with. Winning with people you enjoy playing with is far better than just winning, along with losing with those you enjoy playing with is far less annoying then losing with toxicity. Team cohesion is what keeps teams together and helps them grow and move forward. And for the record KDA doesn't equate to who did the best in a single game.