User blog comment:IamJakuhoRaikoben/Chapter 353: Exorcism, Review./@comment-49.184.76.184-20130928015829/@comment-7418318-20130928135213

He said that, but then we see him remember telling the King, the princess and Arcadios "Let's keep it between us".

If he really altered the memories of everyone, there wouldn't have been any need for those words, so I guess when he said "everyone involved" he really meant "every council member involved", since that was what he was talking about with Jellal.

In japanese things are often left out of sentences when they are apperent form the context. I think this is one such case.