I think there is an even more integrated model that is involved here than what GNM has identified, however, what they have identified has been rigorously tested and outlined by Hamer and his GNM colleagues. I do however see some important extensions to the GNM model that go in the direction of what you indicate. Memories (mental or emotional) are not held in the brain but rather within the tissues and organs themselves. (This is why people that receive transplant organs also gain memories and character traits from their donors - here are a few examples.)

The brain is more an indexing organ rather than a storage organ. This has some significant ramifications on the GNM model. It means that physiological damage to the tissues, organs, and meridian circuits will make you far more vulnerable to conflict shocks and dis-ease. It also means that the Chinese medical model is correct in its correlation of organs and meridians to specific emotions and conflicts. This is a further extension and alignment of the GNM model to ancient Eastern medical models that should be addressed by GNM.