Psychology will march on without you. The scale will inevitably be changed, likely revised many times, dividing into groups and who knows what else. But you aught to start with some measure, and we do have methods of measure for single individuals of a species. Just like humans, scores will change with time and conditions.
Or DJ's mockery, whichever you prefer.
Psychology is leaning towards
useful intelligence being an artifact of sensory feedback and emotional learning, rather than a thing that can exist by itself. You can say, for instance, that a person that knows everything about calculus is smarter than a person that writes books, at any level, and be perfectly right in some models. Then you can turn around and select another that says the writer is exhibiting more advanced intelligence. The problem is, the complexity or uniqueness or whateverness of a behavior is very difficult to quantify objectively. We're better off studying the common origin of both behaviors. Trying to produce a measure for intelligence is meaningless when we still don't completely understand its origin, like trying to decide what color gravity is.
Situational analysis is far more useful for something with needs than accumulated facts (look at CYC, or any number of other expert systems, compared to just about any animal or human), and both require motive and sensation. We happen to excel at both, but you don't learn to do anything without rewards. No stimulus (internal or external) = no thought. If you're never hungry, you never eat, and if you never eat, or drink, or sleep, or feel pain, you're not alive or sapient in any sense of the word.
(sorry to derail the derailment o.o *steps aside*)