I’m ready willing and able to believe that (Bannon quitting 10 days ago) but why would Bannon give an interview in which he contradicted an important part of Trumps Korea policy? That seems like being a vandal, though I’ll confess to frequently not understanding these things in the moment.
IMO, Trump, as President of the U.S., presented a responsible and appropriate position re NK. Bannon spoke in unofficial back-channel verbiage that realistically announced the enormous hurdle we face on the Korean peninsula. Bannon "leaked" it to the liberal press in an attempt to gain the broadest coverage.
The hurdle? Today, NK has the capability to quickly cause enormous harm to SK if we were to employ hostile measures. Given time and sufficient assets in place we could defeat that capability, but not today. Nor would SK agree to absorbing that potential damage.
As mentioned above, it looks like Bannon and Trump are playing good cop and bad cop, and my money says they are working closely.