On Gradus

I found an interesting tidbit about the name Jack. If we use the French form of the name, Jacques, we will find the name means "he who supplants." 

The definition of supplant:to take the place of (another), as through force, scheming, strategy, or the like; to replace (one thing) by something else.

So, Kinbote has replace Jack with Gradus. I'm not sure yet where I am going with this idea...