It looks like the Genotype book is being discounted here.
The book shows:

Worldview:
Reactive: Hunter, Explorer (O; O, A, B, AB)
Thrifty: Gatherer, Warrior (O, B; A, AB)
Receptive: Teacher, Nomad (A, AB; B, AB)

But on this thread are all sorts of Os saying SWAMI shows them as Receptive types.

(Note that in the book, Dr. D very clearly states that each of the six types is distinct and not to be "mixed" with other types (See the section There Are No "Combination Types" – Every Type Has Its Own Unique Logic, p. 111-112). Yes, I know, Dr. D himself retracts that now...?

So what's the upshot? Do we chuck the book?

And is this receptivity only because of whorl type fingerprints?

Well, it may be right, I have not felt SO reactive, but I'm relatively young yet...

It would seem logical that the blood type O didn't prevent an individual to have a receptive worldview in itself as all other blood types can be all three worldviews.

The first blood type diet book has been corrected in many ways in the second blood type book. If Dr. D wrote a second book of GenoType Diet, I'm quite sure there were some corrections, too

If you're following a diet from the book, you need to pick one diet and stick with it. You can't be a GatherExplorer or a TeacherWarrior. You figure out which diet you think will suit you best, and then follow that one. There are only 6 diets in the book, but billions of people in the world.

SWAMI is the next generation of Dr D's diets. It's a computer program that calculates many variables in foods to many variables in your body and figures out which foods are OK for you personally. It also spits out a "Genotype label" but the actual diets it produces often vary widely from any of the diets in any of the books.

With SWAMI, you can be a Reactive Gatherer or a Thrifty Nomad. Any combination is possible, since it's calculating a unique diet plan for each and every individual. Even identical twins could get different results from SWAMI. If every person in the world ran a SWAMI, it would produce millions of different diets, if not billions.