vaderios said:
They could easily use Jurassic Park's CG to make these whatever alien dinos.

If you look closely, even to Ady's R, version when luke says the javas to get away, see the dino in the back. In one part it pop ups of the ground because of bad tracking ;)

-Angel

I've read those Rontos were modified Brontos from Jurassic Park. I understand you guys saying Ady used GOUT or another source for the scene in question, but he could have cut between those shots scenes to keep that last Ronto. But what's done is done.