I chanced upon this interesting hypothesis a while back. Although it is a fascinating and quite entertaining piece, I personally found it to be something more to be amused at rather than as a theory to be taken with any actual seriousness. Firstly, although one cannot say that it is unlikely that Agrippina Minor would cheat on her admittedly violent & unattractive husband (she was notoriously promiscuous after-all), it is baffling why she would even consider doing so with a bumbling stutterer such as Claudius. I concede that it wouldn't be the first case of a beauty falling for a fool (as experience has repeatedly shown me), but nevertheless I digress. Also, physical depictions of Nero seem to show him as taking more after his father compared to the likenesses of the other Julio-Claudian emperors (he looks more akin to the Ptolemies in my eyes though it is doubtful whether Agrippina's loins were capable of time-travel
). What are your thoughts?