OmegaDrake
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Okay how about this.
Ark survival evolved the Carnivores hunter games and James Cameron Avatar.
For those that don't know what Carnivores is, Carnivores is a first person shooter in which you hunt alien dinosaurs. Yes, you don't go back in time to hunt the animals. The dinosaurs are on a alien world, called FMM UV-32, and since they're.... You know alien dinosaurs. They look like old retro and 2000 dinosaurs.
Example, the Cerato is quite literally, has big as the biggest modern day Rex! With the largest Rex specimen weighing around 13,780 or maybe a little more. And Spino is the size of a raptor. And the behemoth of the T-Rex? Completely bullet proof and with the average, or maybe rare, individuals reaching a size up to 19.54 meters, or if you prefer, 65.15 feet long.
Of course, it's not as big as ark rex right? Which is around 23.5 meters. Or the ark giga which is basically freaking as big as a adult skullcrawler. Nor do we need to talk about the giant kaiju that is Titanosaurus?
However, if mixed it up? What if with Pandora, our little survivor makes the dinosaurs such as rexes and spino has big as a giga? With bullet and anti tank rounds proof. These animals, are well animals, but they almost seem to be breed for war. The carnivores T-Rex is actually incredibly tanky sob, and you would think it would be slow....and you would be wrong. Its incredibly fast, smart, and agile and with its only weak points being the eyes, which was later change to its inside of its mouth, its incredibly difficult to kill it.
Not to mention that if it event catches a hint of your scent, this bastard is able to smell you from the other side of the Island! Like legit, it'll smell you and just beeline towards your location. And these bastars don't stop growing either! They can get extremely big if they get enough food. One of my friends show me a trophy of a individual that was 25 meters tall!!
Save to say that Eywa, the Navi, and humans will have their hands full.