As to replacing pre-canon models with relatives in general, you can't really do that for Ouranosaurus specifically (Chialingosaurus exists for Kentrosaurus), and then there's the Chaos theory species, one of which isn't really replaceable.
Yeah, I think my theory is dumb after some time thinking on it.
It was based on the notion that both dreadnoughtus and giganotosaurus have such dramatic differences in variants that it would make sense for Frontier to simply repurpose their original models for another dinosaur. Like I loved the Frontier Dread design, but if it gets axed, I would not mind since Patagotitan looks like its model is a revamp of that.
But there are some variants I do like over the cannon version, and I realized this thinking about the Allosaurus, Iguanodon, and Suchomimus should that get a Chaos Theory model. I really liked the frontier versions compared to the recent cannon versions and I would be bummed if they do get axed.
One thing I am hopeful is finding is the confirmation of ANY non-cannon variant of an animal. So far, the only potential hint we have is the design of the juveniles of dinosaurs that have variants.
Like the baby Pteranodon above I could so work for both Jurassic World and Jurassic Park variant, so that alongside the JP style statue basically confirms the Pteranodon has variants.
It is with the baby Allosaurus I am a bit concerned, cause it looks like it is fully the BABR allosaurus design.
Now I think it would be more likely that they have more unique designs for the babies with differing features, and I hope it is the case, cause I love the Fallen Kingdom Design more than the BABR. However, it could be an indicator that the non-cannon version, or in this case, the more recent cannon version of the allosaurus looks to not make it in.
Again, this is all speculation from my end and with each new reveal, I do hope I am wrong. In the recent video they launched, the Spinosaurus Juvenile has been teased, and I think it looks more like the JPIII Spinosaurus, and not a mix of that spino with the rebirth design similar to the Pteranodon Juvenile. With that said, I hope to see more in the next two months before the game releases and know what are the fate of the non-cannon variants.