5 of the 7 blocks you mentioned were discovered after the potential scam or custom mining software mistake was discovered and the miner notified (May 3rd). It might have been that he fixed or change the mining software or that he stop the scam once he was discovered. The problem is with all the time he spent mining before that time without submitting any shares that were found.
BTC TO
Every eligius block is tagged with "Eligius" ..