A fascinating theory, as it would dynamically change what we know of dinosaurs and how they grew, if it's true. As with many theories in paleontology this discovery is met with skepticism and is still in the process of peer review and debate. As more evidence is presented and opponents to the theory are allowed to challenge it, it may turn out to not be true in the end at all.
It is necessary for the news media to simplify scientific findings in order to make the information accessible and understandable to the general public, but unfortunately that usually results in coming across as "this scientist says this, therefore it must be true," when actually (especially in paleontology) there is much more to the process than that. Only after peer review and further study will there be a verdict on whether this theory is accepted or rejected.
As this theory is presented by the same group who once made the now-generally-rejected claim that pachycephalosaurus, dracorex, and stigymoloch were the same dinosaur by studying model replicas and not even looking at the actual fossils, I'm taking the "triceratops = torosaurus" claim with a grain of salt.
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