One might think that even if some forms of internalism are thereby shown to require a diachronic component, a deontological internalism — a theory of justification that emphasizes epistemic duty and responsibility — will surely be synchronic.  What matters for duty fulfillment is that you are now doing the best you can and not that you did the best you could when you initially formed the belief.  So, the synchronic holdout continues, if you now sincerely believe that Kennedy was partial to green tea, and you also believe that this belief was generated from a very reputable source, then you are doing your best and surely must be deemed deontologically justified in your memory belief.  