It is possible that your husband has a variation of Alzheimer's (for instance, Lewy Body disease) that may progress at a different pace. It is always helpful to get a full neuro-psychiatric evaluation to understand the diagnosis and the progression. Multi-infarct dementia will progress differently than Alzheimer's as will Frontal Lobe dementia. In addition, co-morbid medical diagnoses can have an effect also (i.e. does your husband have any other medical issues?).
Regarding the drugs, aricept is prescribed maximum 10mg so it is unclear what your husband is taking (23 mgr?). Also, it is not clear what a 'resurge group' is. Let me know and I will answer your questions.