I can't help but think this whole 'Jimmi Flickrgate' thing has been blown way out of proportion.
Some child has requested that Jimmi should change his Flickr account name. Jimmi is under no obligation to do so irrespective of the amount of time he's been on Flickr, or the amount of effort each has put into their profiles. As both accounts are currently active and seemingly have different areas of interest it's unlikely, in my view, that one is going to be confused with the other - has anyone done so before this request? There is no need for disclaimers or drafted personal statements, if Jimmi's shots are indeed superior and appeal to a wider audience then surely other users will continue to view his profile - just as they are now! Have some faith in your work!
A simple 'no' to the child's request will suffice or, if you feel a stronger response is appropriate, go with Aureolin's suggestion.
RE: Anything and Everything