Stan Kroenke was sitting in the back of a conference room full of other NFL owners this month when he stealthily pulled out an iPad to watch the other kind of football. He was in Orlando, ostensibly listening to Roger Goodell, in his capacity as the owner of the Los Angeles Rams. But at that moment, he was far more concerned with goings-on 4,000 miles away that affected Arsenal, the storied North London soccer club that had been in his portfolio for nearly two decades. Surrounded by a couple of top lieutenants, Kroenke watched in amazement as Bournemouth mathematically eliminated…