Reading that blurb from the White Oak fellows, I guess I'm more CR than I even knew myself.
Looking over time, I can't claim to be all-OBOD. That was four years of very good study, however compared to the other 49 years, a short time. Putting it all in context, as we needed for the OP's quote of Emma, takes a few examples. Grasping what Celtic or Druid reconstruction is takes a bit of work, like anything.
Red Raven strikes on a point I have long held true. The land itself is the guide to Druidry if one wants to directly connect. And I am sure with the many Celtic tribes there were many differences within even the oldest druid ways.
That all is still far off the science and history, but then is it?
Depends on the view... History changes with each new discovery..