If the dev is the same, how stupid he is logging the same day with both the account?  I mean, if he's the same and he's smart the best think he should do, would be leave the old profile always offline, and using only the new one!
Don't you think?
Unless he's a total moron and don't care about his login activity.  I don't think. So it could be a proof that they're 2 different person.  This is my opinion btw.