I'd say it's just as likely that human intelligence is just someone else's intelligence too with some bootstrapping from nature. Will a 50000 BCE hunter/gather (assume grey/white matter counts are equal to a modern one) given infinite restarts of their life (but not the ability to build upon or add to a body of knowledge) be able to conceptualize general relativity?
i.e. learning how to track animal grazing patterns and when to find and harvest plants could lead to the development of time systems given there's enough nodes [neurons] to make representations beyond direct stimuli. And if you keep adding nodes to the population and the ability to connect more of them; then the further the development can be pushed and more concepts can be connected with underlying patterns. Do this enough then a certain life-form might get all self-important and decided to start labeling things as intelligent or not depending on how much of their own image they see in it.
i.e. learning how to track animal grazing patterns and when to find and harvest plants could lead to the development of time systems given there's enough nodes [neurons] to make representations beyond direct stimuli. And if you keep adding nodes to the population and the ability to connect more of them; then the further the development can be pushed and more concepts can be connected with underlying patterns. Do this enough then a certain life-form might get all self-important and decided to start labeling things as intelligent or not depending on how much of their own image they see in it.