Probably an honest mistake - I don't see how it helps his cause much since you don't know who it is. I mean say he spots an OK2 but you've already worked one...then you'd have no reason to go to the spot.
Unless, he wants to work another OK2???
FWIW, I think you can technically spot yourself - so long as you have NO intention of turning in a log for purposes of a claimed score. It should be a checklog only.
I spotted myself a couple years back in WPX - I had not attention of submitting a log, but instead wanted to see what type of pileup I could generate in the last hour of a contest.