None of those earlier men who considered themselves to be the best person to be elected as the "Leader of the Free World" and the "Most Powerful Person" on earth could be considered "narcissists".
Putting narcissism aside...I don't recall where any of those earlier men were described as having the attention span of a fruit fly! (John Bolton)
Too many of Trumps close aides would not argue with John Bolton's assessment of his former boss...they've seen for themselves how unfit, not fit, not capable this fella is/was!