Kevin Durant has given Nets owner Joe Tsai an ultimatum: Tsai must decide between Durant, a 12-time All-Star universally regarded as one of the best basketball players in NBA history, and the pair of Brooklyn’s general manager Sean Marks and head coach Steve Nash. Durant and Tsai met in London over the weekend, according to The Athletic, where Durant told Tsai he has lost faith in the team’s direction. And now Tsai must make a decision. He must choose what type of ship he wants to run. In reality, that decision should have been made years ago. The Nets should have known once they signed Durant…