Yes, I was able to borrow the Mark Ryan book through a library and I took, shall we say, very extensive notes. The information on the minors is extremely sparse. I've seen little white books with more info. Which I find pretty annoying when there is so much fluff about his childhood and career. For me, the biggest difference between the Ryan book and Potter's writing is the Reflection card. Ryan says it is related to the Hanged Man, and all the youtube creators I've seen have accepted this as well, even when they have self-printed decks courtesy of Mi-Shell. But on her blog, and in Chesca's booklet, it says Reflection is similar to the traditional High Priestess, who was replaced in the Greenwood with the more grounded Seer. She also relates the imagery to the one virtue (out of the four cardinal virtues) that is missing from the traditional deck--Prudence. Ryan doesn't mention any of that.