That's interesting to learn, and makes sense. The ability to delay gratification is both an input for behavior, and an output from other personality traits. Subconsciously, I think I've always had this framework that the traits that influence our behavior were somehow separable or independent, which I guess isn't necessarily true.

Personality traits I guess can be looked at as kind of an N-body problem, with every trait influencing every other. The output behavior is fed back into the system, and can then be looked at as kind of a force carrier. On the outside we think of there being N independent bodies, but as far as the real influence is concerned, they are really overlapping fields with no well-defined boundaries.