From what I understand of what I've read, the only blood type originally ... in humans ... was type O. Then, gradually, due to changing ecological and climate conditions, new blood types evolved through mutation and inter-breeding.
So, I don't see the relevance or applicability of chimpanzee studies to human studies.
The stressors that cause blood type mutation in humans were due to region, weather, and diet. Type A evolved to deal with agriculture; type B to deal with dairy. Type AB came about as the result of interbreeding between A and B.
O hasn't changed at all.