> The game is sufficiently () complex that the weaker player may not even notice the actions of the stronger player

I recommend to people learning to look at the activities of someone "good" at the field but not a star for this reason, I don't know if it applies to all fields but for ex I got the same feeling learning chess by following GM's games (I was lost) and a book like "Master vs Amateur" opened my eyes to typical errors made by intermediate players that won't show up in chess books (another example is "The Amateur Mind"). I tell soccer players than besides enjoying watching the games of the big teams and star players to watch "journeymen" games from a 2nd division to learn the basics.

Also the reason why we frequently learn more from a student mate explaining something that from a veteran teacher or professor, who forgot the struggles of the beginners.

Which is why Napoleon favored generals who had the reputation of being consistently "lucky" - i.e., those whose excellence wasn't easily understood.

Could you maybe clarify the connection? Is the idea that "lucky" generals were actually experts beyond the comprehension of their peers?

Napoleon didn't clarify, I don't believe. The quote was "I would rather have a general who was lucky than one who was good." Certainly, "Beyond possible comprehension by others" isn't what I mean or a likely interpretation. "Succeeded for reasons beneath others notice" would be more the idea. As an example, Grant's tendency to thoroughly disambiguate his orders and always put them in writing (after a Shiloh order debacle) helped his luck a great deal. But it isn't something others would necessarily notice or be in a position to notice. Sheridan had some astonishing luck, but it was possible because he insisted his subordinates (each taking separate routes) be highly disciplined and courageous and get to each point exactly on time, no matter what. (Later, one of those subordinates, Custer, would be cut down because his peers didn't fulfill their orders and arrive on time to join him in battle despite all - and because he did push on as he'd been taught. Coordination only works if everybody's doing it.)