I'd say there's a 97% chance Norbie, John and Greg will all come out. Even if they're staying, they usually sign and come back in.
Oh and Sara...hmm, I've never been to a matinee at least at the stage door for DRS so I don't know. I know when I'm there, she does come out, but is usually unrecognized, so that may happen at the matinee, I don't think she'd stay at the theatre, so there's a good chance she'd be out too, again she rarely signs b/c she is rarely recognized.
"If there was a Mount Rushmore for Broadway scores, "West Side Story" would be front and center. It snaps, it crackles it pops! It surges with a roar, its energy and sheer life undiminished by the years" - NYPost reviewer Elisabeth Vincentelli