I hate this bullshit employee. But, in reading the post, I was not sure the OP was "the boss" as he stated he was "team lead" [Then I joined as the lead. I helped to stabilize the team over the last year. It’s grown from four to ten engineers. Three engineers joined specifically to work with me.] So, that's why I advised to better understand what is going on. I've been a "powerless" team lead more than once, and if you are not doing reviews and if the "manager" is not actively involved in making the team better but using input to perform a review, then its really frustrating. So, either he has the levers to fix the problem or he needs to go to his manager and figure out what levers there are to fix this.