After reading the initial post, for starters, I'm sure some fans will (at the very least) look into this book...but I have a problem that I found that I might construe as a flaw...from which, if anyone can substantiate, I'll relent:
....among the notes listed, it's cited that Priest opened up for bands like Budgie and Black Sabbath... Umm....when was this? Are there any Priest professors out there that might have insight to when exactly this was PRIOR to Priest's co-headlining stint with the original Sabs at OZZFEST '04? 'Cuz near as I can figure...that was the 1st and only time Priest and Sabbath shared a stage together...thereby making it such a momentous event!
I've even scanned Maddrakkett's "JP INFO PAGES" site, and can't readily recall ever stumbling across anything about Priest and Sabbath sharing a trek together between '70-'73.