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With the trump presidency it hard to know what in the hell is going on. Today on MSNBC they were speculating that Bannon resigned so that he could have more direct access to trump. If Bannon stayed he would be forced to get approval to see trump from John Kelly, but by quiting he does not have to report to Kelly and go direct to trump via phone, email, etc. And by leaving the WH, he's free, just like any american, to do, say, whatever he wants without it being directly connected to trump. In other words, he can do his job better\freer outside of WH than within. Objects for him (and trump) remain the same.
Also, on Rachel Maddow, they had a reporter from The New Yorker magize that stated that trump wouldn't let Bannon go unless he, the president of US, got approval from the power men who are calling the shots. The inference is that trump is nothing more than a front man for those who have billions invested in Russia and other shady businesses. This is THEIR opportunity, they have control over the most powerful man in the world; he answers to them.
Background reporting that suggests trump is being controlled by a modern day mafia. Powerful men (real billionaires) who run legitimate businesses, but have no ethical problems doing things that harm\threaten\intimidate people. "What a pretty wife you have, hope she stays pretty for a long long time, just like our friendship"
In general this seems like an over the top conspiracy, but with trump, it is realistic to consider him having past business partners who are very shady, and they have dirt on him he never wants made public. All he has to do is a few favors, such having key people in his ear 24x7. "Our mutual friends would like..."