2) There is nothing "simple" about practising something for 10 000 hours. Even if you spent every waking hour of each day training, that is over 600 days. At 40 hours a week, that's 5 years.
You take (almost) anyone, doing (almost) any activity, working solidly on it every day for 5 years, I guarantee you they get very, very good at it.
The sort of numbers that count are measured in months/years. If you have someone in your raid group for a year, raiding 5 times a week, and they are genuinely trying, I cannot believe they won't improve. Yes, I have raided with someone who after 2 months we had to let go, because he was terrible. The reason though was simple: He never put in the effort. He would attend raids, play a lot of WoW and participate, but he was always passive, never pushed himself, never tried to learn.
But I do see where you are coming from though. Often someone who starts out reasonably good at something will be more motivated to stick with it and work at it than someone who fails at the start. But there is absolutely no way that anyone, having never touched a computer game or heard of WoW, starts playing WoW and a week later is competing for world first kills. It literally takes years of dedication to get to that level of skill.
Most people oozing with natural ability tend to be arrogant and lazy, believing that their innate superiority will keep them ahead of their inferior contemporaries. They tend to underestimate the capacity of normal people to achieve greatness through determination, and by the time they figure it out, they are beaten. That being said, when someone oozing with natural ability comes with that determination and drive to excel, you land up with something special. Roger Federer, Lionel Messi, Michael Schumacher, Tiger Woods, Donald Trump, Barrack Obama (the list goes on). Yes, these people have a gift. But they would never have achieved what they did without immense amounts of hard work and dedication to their craft.
If you are having to explain tactics to someone fifty times each week, and if they never learn to step out fire, there is a clear commitment issue. That player is clearly not trying.my answer is made with a proviso: I would choose the *more committed* player
The poll was "hypothetical" for a reason, and the OP stated as much:
This is not a simple coincidence. People at the top of their game are those putting in the effort. Your example of the "brilliant" yet unreliable player is pretty much fictional. They might seem that way to a new guild struggling to find their feet, but once you are in a group that raids together regularly, and consistently and has been doing for a significant period of time (years), you realise that these supposedly "skilled" players are not nearly as godlike as you once thought.top guilds usually have raiders both skilled and active