Dino Crisis/WMG

Just what happened to the scientists and military personnel in the first game?

 * While we do see several corpses throughout the laboratories, the complex is mostly deserted. If most of the staff were evacuated during the experiment, why didn't they make themselves known after things went wrong? It could be that the same circumstances that brought the dinosaurs into the future sent those people into the past where they now have to fight for survival in a Fate Worse Than Death.
 * The dinosaurs ate them.

Why there are so many carnivores.

 * The Third Energy's exchange targeted the very Late Cretaceous, after the meteor impact had kicked up the dust cloud and started a nuclear winter. Plants died first, then plant-eaters, with scavenging carnivores briefly thriving before they eventually ran out of prey. It was just before this final extinction point that some of them were transported into the modern century. Also, the Therizinos are a previously undiscovered species, not genuine Therizinosaurs.