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We here in the US have apex predators in the Rocky Mountains (grizzlies, wolves) so I don't see how this is a blocking issue

Because those ecosystems have existed with those predators for thousands/millions of years and have balanced themselves.

Imagine bringing cold-resistant crocodiles to the Rockies and how much that’d shake up the ecosystem.

An apex predator is only an apex predator in absence of a bigger, more dangerous predator.