Centering Options

[geshaw]

So I've got a Initiate Grade 1 who successfully learned the Centering Metamagic ability. At this point how it all works is a bit fuzzy.

The book says 2 skills are involved, the Centering Skill (linked to willpower) and a "creative skill".

Now I understand Centering Skill is a new active skill that is purchased and improved like any other active skill; however the Creative Skill is the issue for me. Where does this come from and what is it for? The only thing I did figure out for sure is it determines how high your Centering Skill can be raised. ("Centering Skill can never be raised higher than the rating of the creative skill.")

Does it serve any other purpose?
Do I have to spend Karma to improve it like active skills (allowing me to improve centering skill)?

In the example under Adept Centering:
....he learned Centering (Zen Meditation)....
....He rolls his 5 centering dice (meditation skill 5) against TN....

Is Zen Meditation his creative skill? If so, does the second line say he has rank 5 in Centering and rank 5 in his creative skill?

Does any of this make sense so far? I hope I've asked my question in a moderately understandable way and appreciate any help from the community. i'm probably making this more difficult than it needs to be; though shadowrun seems to be full of grey area's where rules don't always make sense.