Johnny and Gyro are opposite sides of the same coin when it comes to sentimentality.
Johnny cries all the time and lets himself be carried away by his feelings, while Gyro is able to put them aside to to make the best decision, no matter how stressful the situation is.
But in the end, they meet at the same point: they both hate feeling.
Johnny hates it because his emotions overwhelm him most of the time. He lives in a constant depressive state where he can't let go of his past, and even before he lost the ability to walk, he seemed to live a life filled with superficial things to fill the void left by Nicholas's death and his father's abandonment.
Gyro also hates it because it goes against everything his father taught him, and both his work as a doctor and as an executioner are affected by his emotions in one way or another. He knows that, at the end of the day, things would be easier if he did not feel.
They never say it, but I think Johnny sees in Gyro the person he longs to be. Not calmer, but more rational, someone capable of acting before feeling. Meanwhile, Gyro admires Johnny's ability to feel, to express his emotions even when it may not be convenient, because deep down he wishes he had that same freedom.
Both of them wish they were a little more like the other.
