Luke Grimes offered rare insight into his relationship with former onscreen dad Kevin Costner after their time on Yellowstone. “I have never spoken to Kevin since we stopped working together,” Grimes, 42, told USA Today on Monday, October 5. “Not for any other reason other than we are both just busy guys and life moves on.” Grimes said “it would be cool” if Costner, 71, found a way to reprise his role as John Dutton on CBS’ spinoff Marshals. “I doubt that will happen at this point, I just don’t know,” he noted. “If there was a flashback, I would want it to be with [Kayce’s...