It does seem that the “Bannon is in charge” news coverage a while back is what caused Bannon to be marginalized.
There’s also a way to manipulate him for good though. Talk about how he can increase his poll numbers by doing good things and going against Republicans. It’s a risk because it could make him popular enough to get re-elected though.
Although I don’t think that’s much of a risk. If he started to back-stab Republicans like that, you can be sure they’d start to get serious about impeachment — so it’s a win-win.