T-rex at the end was so obnoxious for thinking he was now the king of the dinosaurs for helping kill the I-Rex.
If that was the qualifications for ruling it should have been at least a Council including the T-Rex, Velociraptor, and Mosasaurus.
This movie was meant to show the sad fact that Dinosaur politics is highly biased towards larger creatures and that this racism should not be tolerated.
Shame