“He assimilated with the Pop …

“He assimilated with the Pop philosophy,’’ one NBA executive who is close to Udoka told The Post. “Udoka is a person very driven, meticulous, hard on himself. He’s a perfectionist.” Udoka, who oversees the Sixers’ defense, joined another Spurs alum in Brett Brown in Philly. Torrel Harris, the agent for and father of Sixers forward Tobias Harris, has been most impressed with Udoka, a former Knick. If the Bulls’ job officially opens, Udoka is expected to be a frontrunner, especially now that former Sixers executive Marc Eversley just joined Chicago.