“It’s fun to be a part of once, but I’m an interloper as I always am, so it’s not easy,” [Bob] Odenkirk says, explaining that he doesn’t expect to return … unless, he jokes, they do a Broadway version of “Brian’s Song” with [Michael] McKean in the Billy Dee Williams role.” … But McKean says the play offers more than showy roles. “It’s about toxic masculinity and what’s in our nature,” he says. “There’s the slow boil everyone is on in a game with high stakes where your success says something about how much of a man you are.”