Its not really a suspicion. Its documented that Breitbart etc. went to war with McMasters last week. it forced a statement from the WH saying they fully side with McMasters.
Does Trump actually give a fuck? Doubtful. If Bannon goes its because the Generals are exerting their power on trump
Does Trump give a fuck about leaks that make the White House look bad? Are you kidding? That's probably one of the only things he cares about.