Sean “Diddy” Combs was once the most ubiquitous man in hip-hop.  The rapper-turned-mogul-turned-impresario moved successfully through the ‘90s and aughts, proving himself an indomitable force by telling, not asking, the world to change what they call him every six months; Sean John, Puff Daddy, P Diddy and finally, Diddy.  He made sexy, infectious party anthems and soon became the sound of an era that felt limitless. In the process, his brand soared; he dated beautiful women, was listed on Forbes’ 40 entrepreneurs under 40 and became the first hip-hop artist to displace himself at number one on the chart. Music…