From what you describe kebab is more about grill but without fire. Coals should be very hot, but there should be no fire at all. They are giving a lot of warm and that’s a way you are cooking. It’s a way faster method than “hours”. It’s about minutes and you need to make cubes of meet of 2 inches. its very important to not make meet dry, but you are making crust and it’s not about raw inside. Its about balance. Meet juice should stay inside(it’s normal for any way of meet cooking). And of course marinade - its about the way to make perfect flavor and save the taste of meet, make it stronger. I think coals part is more about technique and when you are doing everything well and in right time, you will get result anyway, but the magic is going in the time when you are doing marinade.
When I will buy my home, I will make a deep dive into BBQ tradition, I like the different ways of cooking and I believe there are tonns of different secrets and aspects of making it better and differently.