Let's set the egos aside for a moment, there's a difference between what people achieve following a programme from a book, and what they achieve with in-person coaching. Let's not pretend there's only one competent coach in the world.
Let's assume the guy wants to stick with a low-bar squat, and help him sort it out.
Yes, i made this thread for advice. But it was mostly for advice on how to fix my elbows. I know my lifts are weak, but I'm working on them.
Your elbows look fine, I'd have to see in person, though. In general, the further back the elbows and the closer in the hands, assuming straight wrists, the tighter it'll all be. You'll be restricted by individual flexibility and so on, though. Take that week off, rest and ice, then experiment a bit at low weights and try to find a comfortable grip.
What really concerns me is your back. Notice that as you come out of the hole, your hips rise up while your shoulders stay at the same level. As a result, the bar drifts forward past the middle of your foot towards your toes. This makes you have to do a good morning out of the squat, takes the lift away from your glutes, hams and quads, and to your lower back.
The knees caving in are part of this.
Drop the weight by 20-30kg. From the hole, concentrate on keeping your knees out, driving up with the hips, but keeping that back angle the same rather than letting yourself drop. This will bring in your glutes and hams more, and once you get used to it, your squat will actually be stronger, you will be able to lift more than now. Just ask Danco, he had the same issues.