Not that one would cause the other, exactly, but that both would be different utterances of the same principle.
* * * * * * * * * *
What would that principle be? If the end of Æther can be seen as a shifting paradigm, a death of some traditional belief, a frontier, of sorts, then that means Merle sees the capture of Blinky in a similar manner. Is that it? The death of some kind of innocence? The end of some kind of freedom? The loss of a frontier? A massive times they are a'changin' moment?
I know those speculations aren't actually principles but things that happen when a principle falters or is radically altered. But then what is Merle talking about? Is the failure of the Michelson-Morley experiment an utterance of the new principle that science just hasn't figured out yet? That seems plausible. That the failure of the experiment leading to the death of Æther is an utterance of Einstein's theory of relativity (specifically that the speed of light in a vacuum is the same for all observers regardless of the motion of observers or light source) becoming a major understanding of reality, as this very experiment influenced Einstein's experimentation on the theory.
Let's assume that's the utterance: the failure of the experiment was because the universe was vastly different than the one where Æther was needed for light to travel. That means Blinky being capture also, somehow, expresses a post-Æther reality based on Einstein's future theory. Both events portend the future reality by their outcomes.
But how does the capture of a fur-stealing criminal have anything to do with physics? With the speed or transmission of light? With special or general relativity? I could just wimp out and suggest that the utterance is that truth will eventually come out. Criminals found and captured; Æther discovered as a fraud. But that's way too simple, right? Plus, once again, it's sidestepping the idea that Blinky's capture is an expression of Einstein's Theory of Relativity (special or general? I don't know!).
Perhaps the relativistic aspect of Blinky Morgan's case should be looked at. Does it have something to do with observers and how they see the event? The common man sees Blinky as an anti-hero, perhaps hoping he evades the law even though they accept he and his gang committed the crime while the police see it differently. Blinky's capture is an expression of how different people can see the same event in different ways, depending on their "motion" (motion here simply meaning, I don't know, class? Politics? Economic level?).