Hello and welcome!
There have been (at least) two threads started recently about this book with some very interesting comments/insights, so run a search for those.
I don't know the answers to your questions, but just my own experience: Since I've been Primal, on the rare occasion when I do eat legumes, they make me dare-not-leave-this-house gassy...way more gassy than prior to Primal. (And it's painful gassy, too.)
Another thing that I've noted irt weight loss from being a reg on this board: Different things work for different people. Some can lose weight on fruit, some can't. Some can on dairy, some can't. It's definitely not one size fits all. n=1.
"Let food be thy medicine and medicine be thy food." -- Hippocrates