That change happened right after he and I finished a trade.  I left him feedback, then noticed I had left feedback for an unrecognized name, but I had specified that it "Killyou72" in the feedback.  I thought I was losing it, but then he PM'd me and I realized that the accounts name had changed.  I can see how a guy would grow out of a name like "Killyou72."

Blacknavy recently changed his name from Matthias9515.  I guess Theymos is taking requests.