Joe Tsai had no words for what he was watching. Instead, he turned to emojis — a few exploding heads, a few saluting faces on Twitter — as he watched Kyrie Irving’s emphatic, one-handed, put-back dunk on Monday night. As if there were any doubt, the Nets owner has noticed what his star point guard is doing. Irving has re-established himself as one of the premier guards in the game, could be an All-Star for an eighth time, has helped lead the Nets to 12 straight victories and brought them back into title contention. The present is promising, which means...