No idea if Benji is a good coach or not.
I support the Bengals in the NFL and they got a young unproven coach 4 years ago. First season ran last and fundamentals of defensive and offensive line were getting dominated by the opposition, great vet players were unhappy and played badly and were moved on or left. 2nd year not much better, finished 4th last (out of 32) and again just could not compete physically. Throughout that time the young players seemed to be drinking the koolaid because they backed him and liked him. Then third year they make the Superbowl and the Bengals had their best season since the 80s. At the end of that 2nd season most the fanbase (including me) were absolutely livid he'd been retained. Everything looked terrible, absolutely no progress, defense an embarrassment. They kept him, team started winning. Fans were wrong.
I don't know if Benji is any good. Api believes in him, luai and others want to play for him. I guess I just mention the Bengals and their coaching to say that you can't always judge coaching by performances on the field. It takes players and coaches time to adjust and get things to go the way they want. I hope this is true of Benji, I'd love for him not to tarnish his career with a bad coaching stint.