Difference in monk's many chakras

I'm leveling my monk through HW, and the sudden new additions/changes on a monk's chakra has me confused.

In ARR we achieve opening the seventh chakra, and we only know it as just chakra. In HW, though, we learn that there is 14 chakra, in light and shadow. We learn pretty early the WoL and Widargelt have chakra of light. Later in the story, though, we're told in the level 56 questline that we're close to opening all chakra... We're only missing one more of shadow. Widargelt also called us, once again, disciples of light.

This has me a bit confused, so here's a list of my questions.

-If the WoL is a disciple of light chakra, why are we unlocking shadow chakra?

-At the same time, if you fight against a disciple of one aspect of chakra, you open the opposite aspect. Widargelt is light, so why wasn't the WoL shadow aspected by fighting him in the ARR ending quest?

-If the 14 chakra are 7 of light, and 7 of shadow... What does that make the chakra we were unlocking during ARR? We were only ever told it was just plain chakra. Are there 21 chakra by this logic? 7 of chakra, and the other 14 are light/shadow?

Most of that is explained during the HW job quests.

All the chakras we opened in ARR were light. Widargelt was teaching us light sect methods even if he didn't realize it at the time. We started opening shadow chakras in HW because we started fighting shadow practitioners, and that's how that works. You can only open one set of chakras on your own. The other seven can only be opened through combat with the opposite sect. That's why O'tchakha and D'zentsa started opening light chakras at the same time we were opening shadow.

This culminates in the Lvl 60 quest when opening up all 14 light and dark chakras enables you to do something you can't otherwise do with just having one set of 7 chakras open.

As of the Lvl 70 quest, Widargelt is still trying to figure out how to get all 14 chakra open without having to have the two different sects fight each other in live combat situations (since that's really dangerous). I would not be surprised to see the topic be dealt with again in coming expansions.