I disagree... I think Nx scale is actually more of a personal characteristic. The easiest way to detect it, even for small Ns, is to notice the situations like when you are addressing all the questions you have for a sibling team to one person in that team. Instinctively from past interactions, you know they have a good mental model of their service and can give useful informed answers, or good pointers when they don't know. I've worked with teams where somehow the entire rest of the team is either useless, or will BS you with "I think it probably..." "It should...", so you have to read their code yourself anyway to verify. Ditto for e.g. scrums, there are people who, even though they are earnestly trying to e.g. fix something, have trouble explaining what they are doing and what problems they are facing, there's just some mental clarity that is 0.Nx (or Nx or 1x for normal, I guess), and that translates into the work being slow (or fast).

I think something similar applies for most development tasks... some people just do everything better, and it's often not even a trade-off - they produce cleaner code that is also faster and do it in less time...