Because he wanted to leave to play more football and we got a decent fee , he also isnt a natural left back he is a midfield player adapting to play left back , we havent had a natural top class left back for years , if Zinchenko had stayed he would have always be viewed as a stop gap.
Personally believe he should have stayed because he always gave 100% and rarely let us down when he played but if a player wants more first team football you sometimes have to bow to his demands , and if we dont win the title i would love Zinchenko & Jesus win it , both had great moments with us and will always be respected by our support.