Sentence:  Whether Bannon was sacked, resigned or left by mutual agreement – as usual with the Trump administration there are contradictory accounts – is immaterial. His exit, <WSD>stage right</WSD>, follows that of a clutch of other senior White House aides and reinforces the impression that his presidency is unravelling chaotically only seven months after he entered the Oval Office. 
Meaning of the word marked with <WSD> tags:  Involving a change of whether one is involved in a situation.