Question: Why all the build up of John having sent the Russian eye-surgeon guy to jail, suggesting that he will hurt John; only to have him successfully complete the operation, and take care of John afterwards?
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Chosen answer: It's what's known as a McGuffin; a plot element that seems to be important when introduced, but serves no purpose other than to intrigue/distract the audience. The term was popularised by Alfred Hitchcock.
J I Cohen
That's not *quite* what a MacGuffin is. A MacGuffin not only seems important, it *is* important; in fact, one of its two diagnostic characteristics is that a MacGuffin is something around which the entire plot revolves. The other property fundamental to what makes something a MacGuffin is the fact that the origin, purpose, function, and, in some cases, even identity of the object is left either vague or completely undefined. The briefcase in Pulp Fiction is a classic example (although there *is* a compelling argument that the object in the briefcase is in fact a specific artifact).
Well, according to the doctor when the operation is beginning, the doctor reveals that in prison, he spent all of his time in the library, including books on medicine and technology. As a result, he found his "true calling", and is thankful to John for helping him see that.