Maybe not matters, but it takes certain qualities to take 10 random NS players and turn them into a team. Leadership, charisma, ambition, a determination to see that ambition through, organisational skills, people skills, the list goes on. It all sounds easier because it's for a game, you just play, but believe me it's no walk in the park.
Being in the top clan is irrelevant, it's about the personal attributes that I display through my NS "career." If nothing more just the ability to form a working coherent team from a group of strangers. Add that to the experience you get from working on NW and I think you get a good idea of the sort of guy I am and what I'm capable of. It might not be directly related to gaming or MODs, but in my opinion, leading a succesful clan requires the same characteristics as leading a succesful mod; and leading a succesful mod is always a useful thing to have on your resume.