This wouldn't be the first time Markus had heard the term, and he knew Max didn't mean it as a complement. It actually gave Markus an interesting insight into Max's past and experiences. Markus, however, lived in the world of innovation; a world where a new face, a new perspective, and a single unexplored thought could change lives and save the mission. Astronauts took the term, calling themselves TFNG, as their own post-apolo because of such innovations. Because of that fact, Markus prefers to think of himself as the Rubber Duck.
Still, Markus knew what the man meant and didn't take offense; he even offered a nod of acceptance. Markus didn't see any need to argue the point, even if unsolved cases were often figured out due to a single bit of missing evidence being found, even years later. However, he was unwilling to turn away. “I can't explain what it is like to lose your twin. But, tell me, is there no one in your life that if you were to lose them, you wouldn't search the ends of the earth for answers?”