re:elegantSpinstress

">Why does Dirk get deja vu about uu? (I'm gonna try to answer this one as best I can lol)

Prince of Heart stuff. He's not actually getting Deja Vu here from a previous conversation but rather it's complicated weird "Splinter" stuff. This is a reference to the scene in the first few acts when Dave and his Bro fight on the roof. This Dirk isn't the same as Bro Strider, but he's still "A Dirk". When he says he has Deja Vu, he's talking about that other Splinter of himself, Bro Strider. He feels like he had that conversation before. He technically did, just not in this universe."

That makes sense for the second instance of deja vu

"uu: "HELLO DIRK."
uu: "I WANT TO PLAY A GAME."
uu: AND THEN LIKE.
uu: "BRO."
uu: "ROOF. NOW."
uu: "BRING JuJu."
uu: AND THAT'S IT.
uu: YEAH. THAT WOuLD HAVE BEEN GOOD.
uu: COLD FuCKING BLOODED. TO THE POINT. DAMMIT.
TT: That actually sounds familiar too.
TT: Are you sure you haven't said something like that before?"

but it doesn't make sense for the first

"uu: IT'S NOT THAT I DON'T MIND. IT'S THAT I FAIL SPECTACuLARLY TO GIVE A SHIT.
uu: THERE IS SuCH A BIG DIFFERENCE.
uu: AND THE FACT THAT I MIGHT NOT CLuE YOu INTO YOuR FATE ALL THE TIME.
uu: DuE TO MY AGGRAVATED APATHY OVER THE MATTER.
uu: IS AN IMMuTABLE FACT. I AM STATING FOR THE RECORD.
uu: IT DOES NOT MEAN THAT GIVING A SHIT IS WHAT IS TAKING PLACE HERE.
TT: I feel like you've said something like that before.
TT: Different statements, but in that exact syntax."

This syntax that Caliborn is using is used only by Karkat, and, sarcastically, Kanaya. Neither of these conversations where they use this syntax are with Dirk. They're with John and Aradia respectively, who I can't see any arguments for being splinters of Dirk.