Hi, Lewis ...  Great post on a subject near and dear to this introvert's heart:).

Quick observation:  I am probably one of the most outgoing introverts many people run into ... my career has repeatedly thrust me into positions where speaking to, directing, and facilitating large groups is one of my 10,000 hours skills.  HOwever, in true introvert fashion, I disappear regularly to recharge and am extremely happy to spend entire days or longer periods amusing myself quite well:)

I think introverts bring much to leadership roles, but here are my three nominations for the most important introvert skills:

1)  Ability to have those quieter, one-on-one conversations that create and nurture relationships.

2)  Ability to step out (or even avoid) the spotlight without feeling a sense of loss, while being comfortable with letting others enter that spotlight.  This speaks to your point about extroverts who might be threatened by this very thing.

3)  Thoughtfulness and mindfulness of the world around them, noticing things and seeing connections that others might miss.  I guess this is the same as your first point about analytic ability and connecting the dots.

All in all, a very useful post - thanks!

John