Great. Please explain Paul Tudor Jones, Ed Seykota, George Soros, Warren Buffett - for that matter, all successful traders in the world. Are they all accidents?
You seem to imagine that a trader's edge is some single fixed action, carved in stone and to be followed religiously whether it works or not. I don't think I'm going out on a limb by saying that this perspective is absolutely and categorically wrong.
Which has nothing to do with an edge. Risk management is comparable to brushing your teeth and taking a shower; it's good hygiene, but it will not result in big muscles, a good tan, or the ability to land a 300-lb punch on target. You have to go beyond basic hygiene and take positive, repeated, correct actions to achieve those.
Until he learns to practice that basic hygiene, yes. But that will not make him money; it will (or should) prevent loss.
Unless, of course, the probabilities - remember, that thing we were talking about before you changed the subject? - don't play out. Risk management also does not offer absolute guarantees.
Great. What does that have to do with trading NOT being about probabilities? That's what your question implied, and it would be nice if you'd stick to that subject and explain your viewpoint (which, for the moment, remains incoherent.)