MGM seems set to recover its global 100 year old lead in motion picture entertainment, moving this week to buy exclusive control of the Epix movie channels, already the fastest growing US channels over the past 5 years. MGM will buy the 81% of Epix that it doesn’t already hold from Viacom and Lionsgate. This sets up MGM, ready to ride-again, after years in the doldrums, marking time, after being bought and sold by Sony and private equity groups and riding out a bankruptcy in 2010. The move also importantly creates a line of separation between Epix and Starz, similar conglomerations of movies, put together originally to support movie channels on US TV, but more importantly well positioned to be…