Everything you said is still consistent with the beta amyloid theory. The plaques don't cause dementia, they are supposed to lead to damage. Once dementia sets

Everything you said is still consistent with the beta amyloid theory. The plaques don't cause dementia, they are supposed to lead to damage. Once dementia sets in, there is no turning back, the neuronal network has been damaged enough and you can't replace neurons (not most of them) Dementia is the main symptom of Alzheimer. And there are other causes of dementia, too.