By Justin Barrasso Follow along for live updates, highlights and more from Saturday’s action-packed card. Today will determine the best fighter in the world. Charles Oliveira steps into the cage with Islam Makhachev in the main event of UFC 280 to decide the new lightweight champion. With all due respect to Alexander Volkanovski, the winner of this bout will be the pound-for-pound best in the world. It is an incredibly hard fight to speculate, as Makhachev has manhandled opponents in a way that is foolish to imagine happening against Oliveira. The strongest indication of how this may unfold is…