If he's learned. Therein is a key responsibility of the manager: if they've learned, you're 100% right. If they haven't, don't care, don't get it or whatever

If he's learned. Therein is a key responsibility of the manager: if they've learned, you're 100% right. If they haven't, don't care, don't get it or whatever, then you also need to take responsibility & replace that person.