Just keep changing the stories and the base will keep changing their views to keep up with those the don sez they should believe. The smarter among them may notice contradictions and contra indications but say nothing and just bobblehead along with those who notice nothing and hear nothing but the voice of the don. He tells them what to believe/not believe and when and for how long and to be vigilant about keeping up with his switches and backtracks and reversals. He will be testing them to see which iteration they believe and when.