I'm inclined at the moment to (and did) just mass edit them, and delete the artist entries for inaka and ika_(artist), so they don't come up in and thus confuse find artist/source searches/mass edit.
They're too simple and potentially ambiguous - and thus "valuable" - to have tied up in aliases. I expect there's a very good chance that there are artists out there we'll add one day using those names. Better to have the tags available in that case.
