I've actually been contemplating this for a while, but I wanted to know what other people think. In episode 127 (A Bewitching Flower) of KHR during TYL!*Hibari's fight with the Phantom Knight, TYL!Hibari says, "I'm so jealous..." at 17:02. It was random and unexpected; I have no idea how to interpret what he means by saying that.
I do have a theory though, but it's not something incredible or anything—just an idea.
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TYL!Hibari says to the Phantom Knight: "You're the one who's getting bitten to death," and then, "I'm so jealous..." After that, TYL!Hibari switches places with Hibari. So maybe TYL!Hibari meant that he was jealous of Phantom Knight for being able to get the crap beat out of him by Hibari? But the victor of their fight was undetermined; I guess TYL!Hibari was just really confident in his younger self. I mean, he's Hibari. XD
*TYL! means "tens years later." I actually didn't even know this before, so I bet there's other people who don't know either lol.
And the way TYL!Hibari said it—to me—sounded sort of perverted, lol.
So what do you guys think?