The young adult Rex in JP3 was supposedly the infant from TLW. Dunno if that's canon or not. But just imagine, as the Spino exits the scene at the end, mommy and daddy T-Rex show up and kills him/her in revenge for what it did to their child. Then InGen crew later found the remains, cleaned the skeleton, and put it on display in Jurassic World.
Given how they're going for a bit of a "*wink wink*, TLW and JP3 was a bit of a shame, guys *wink wink*" angle, I wouldn't be surprised if either Rex or D-Rex wrecks the skeleton during the movie, maybe even stepping on the skull. Fan agony goes full schadenfreude circle.