When I started feeding raw I didn't take it anywhere close to as gradually as is recommended. I think I did chicken for about a week, then added liver, then some other meat for a week, then another. But I didn't go through all the different meats I'd be feeding in the coming months. I just started putting anything into their bowl. I hadn't read that much yet on it. Luckily none of my dogs had any issues to speak of except maybe a little loose or hard stool at first until I got that figured out.
My question is...what do they do in nature when hunting or scavenging? Do they say to their buddy, "Hey, no, don't go after that rabbit. We're still on chicken. And skip the liver. That's next week." I guess more dogs have allergies these days in our society...with all the over vaccinating and chemicals, the over exposure to one kind of meat perhaps? But seriously, is it really a problem to get going on the essentials like organ meat? I wouldn't wait for months and months to begin that.
My feeling is that delaying organs is ill advised. Dogs (and especially puppies) need the nutrients, and delay can cause "pickiness" (which can be a long-term problem).
Best IMO to start early, while keeping amounts small and working up.
For the transition, rather than feeding over-loads of bone, which can cause GI issues and vomiting, in hopes of avoiding loose stools, I think more good comes from feeding bone in moderation while reducing fat at the very beginning. Fats are essential, but dogs need to be conditioned to fat burning/digestion. Better to address the real issue (the need to condition dogs to fat) than create more potential problems in over feeding bone to plug dogs up.