The reason why I place intrigue higher is because it is one of the three attraction igniters (along with dominance and sexual tension). A lot of nice guys have credibility. But they act predictable, tell their whole life story to women as if they were seeking a personal therapist, are easily categorized and manipulated, aren't really much of a mystery or challenge. These are the male orbiters stuck in the friend zone. They have no attraction igniters working for them.
90% of advice from sosuave is pretty much telling them to be more intriguing/mysterious/challenging.
Once you have some attraction igniters working for you, then she will vet for credibility.
But credibility is very important as well. I've developed entire game strategies around credibility (Infiltrating social scenes, increasing your social sphere, showing up to social environments where women see me more than once, vibing with people on your wavelength, etc).
In fact, I would say that I take dominance, sexual tension, and intrigue for granted (I think it is something that should be natural, though you can certainly improve it) and I focus solely on credibility as it has been my number 1 sticking point outside of a college environment and trying to create a social life/ecosystem that constantly produces women that see me more than once.