I am going to reply as someone totally ignorant of Zen.
Nobody can "know all about Zen" because Zen seems to be about
focusing on the individual experience and not the official statements
and teachings of Zen. Individual experience supposedly adds to
insight which can lead to enlightenment. Who would have much
individual experience- ex-cult members who start searching for the
real truth.
Sure, there are books and Zen masters out there to get you started.
We cannot learn unless someone starts us out as a teacher. But
the ability to become a Buddha is within each one of us, so each must
have a different experience on their different path to understanding.
I could imagine that Zen could be great for one such as me who has
been so bitter at WTS since discovering the real truth. It might help me
to focus on benefiting from the bad experience. Almost a process of
elimination: JW's don't have the path to enlightenment, but I have learned
so much.
I may one day look into Zen. It kind of reminds me of the movie from
the late 70's- ALTERED STATES. It was theorized that each person
has the molecules or atoms in their body that were present eons ago,
so they should be able to tap into that time period.