Robin kept her expression carefully neutral when Marco asked if she really thought he should step down as first mate. It isn't her decision to make, nor will she make it for him. He's the only one that can make that call. She'd only wanted to challenge his notion that he has to be in the position he's in. As for conviction...

"It's natural for most people to question their convictions every so often. It's how we keep them burning brightly," she smiled, giving his hands a squeeze. "You aren't weak or disloyal for doing so."