In the last paragraph:

Please, honored followers of Zen, long accustomed to groping for the elephant, do not doubt the true dragon.
I understand the reference to the elephant - the old tale of blind men groping the elephant, one thinking the ear is a leaf, the other the leg is a tree, etc and that the elephant also represented wisdom? and mental strength in Indian philosophy - a metaphor for trying to grasp the Buddha-dharma with the intellect or concentration, OK.

What does the dragon represent in this passage? A general power, or experiential force, something more specific? I know in China, the dragon represents the emperor, the masculine aspect, and is a rather unpredictable and aggressive nature, also responsible for weather. Not sure how that relates.