Why isn't this person just a consultant? There is nothing wrong with just being a sprinter, but isn't there something to be said for being able to run the mara

Why isn't this person just a consultant? There is nothing wrong with just being a sprinter, but isn't there something to be said for being able to run the marathon? If the spark is gone after only a few months at a company, seemingly no matter what the company, maybe the problem is within and not with the companies that you're working with?