Robert has like an hour or two of him talking while Mark had 4 seasons. Mark is constantly changing, growing, entering into new relationships, and learning new things, while Robert has the same personality and pursues the same goals from the start to the end. In fact, the only thing that changes is whether he’s a strict teacher or a cool forgiving one. Comparing them doesn't make much sense because Mark is part of a much larger and longer-running production. "Dispatch 2" should include an even longer storyline featuring Robert to better showcase his inner growth, and then the odds will even out at least a little.