Did you happen to keep a record of these ratings? They might be useful in determining who stole his account. I wouldn't be surprised if they left positive trust for themselves and/or negative trust for their enemies. I can't see why else someone would hack a DT account and keep it secret for so long, they knew any trust they left would be worthless if it came to light that the account had been hacked.
The Wardrick account left a negative trust rating for tspacepilot and Brad Harrison, left a neutral rating for turtlehurricane (although I believe that
may have been removed prior to yesterday), and left a positive trust rating for tomatocage. I don't think the account was hacked though because the "real" owner would have likely come back to attempt to claim the account sometime between May and now, especially considering the amount of business it was conducting prior to May (assuming he wanted to remain on bitcointalk).
He also left to me a neutral trust rating and now it has been removed. The hack was only a poor skit and maybe you are right, his account was bought by someone who knows how the trust system works....