What Did Paul Heyser Learn?

Heyser talked about how he learned a lot teaching revelation this past year. What exactly did he learn? i would say, in broad terms, i have a much better appreciation for the the amount of connection that revelation has to the old testament. I mean, i knew it was a lot, but it's hard to go anywhere in the book and not run into it. Heyser: "I didn't quite know what to expect"