It has absolutely nothing to do with the Enneagram types. In fact, the Enneagram symbol has very little to do with the types. The two have not been used together for thousands of years as much of the hype would have you believe. Sometime in the 1950's and 1960's Ichazo placed some ego fixations on the Enneagram symbol that Gurdjieff used in a very different way. The Gurdjieffians originally questioned that use but everybody began ignoring that and believing the hype once the Enneagram personality types became popularized. I guess the winners do get to rewrite history.
If you want to explore types with the Gurdjieff symbol, the planetary or essence types attempt to use the Enneagram symbol as Gurdjieff intended (there was a thread about it not long ago that you can find or perhaps someone can point you to if you're interested). They too have nothing to do with the personality types.
This is true. The Enneagram as introduced by Gurdjieff, has nothing to do with enneagram personality types, by Ichazo. The Enneagram gurdjieff introduced, was fundamentally, applied in the consumption of foods, and how we have natural channels in our organism for the digestion of the foods... but with the exception of solid food/water, our bodies can not digest the other foods alone to continue the natural channels through which substances are transformed in the body. The objective of this enneagram use was to explain in symbol, how a man can grow a soul, or manifest a soul in body -- as Gurdjieff taught that man was not born with a ready made soul within, but that a soul had to develop and be nourished. In a sense this related to the development and expansion of consciousness and being, the enneagram did. Gurdjieff also taught that one could not understand the enneagram intellectually, but that it could only be understood through movements, the movements that he referred to and taught. This reason is because the enneagram, although a static symbol, in its more abstract nature is a alive, it is in perpetual motion, as the laws which make it up, are always in working. So, forgetting all the stuff about growing a soul, as one will only look at that from the way we perceive a soul in pop-culture, which is all imagination for the part, the enneagram was tended as a diagram for how substances are transformed in a person, that establishes the growth of being.
Gurdjieff, supposedly, spoke about a different kind of astrology, but this dealt with the study of "types". With Gurdjieff, this study of "types" was about the essence, not personality, which he regarded as a false thing, something akin to crust, or a shell that formed over essence, which had its development from ordinary life -- education, imitation, words... where as essence is qualities and a state one is born with, dealing with hereditary results and something else. And Gurdjieff once said, that in the enneagram, anything if it is real, could be explained through it. So who knows if Gurdjieff taught such an application with the enneagram as far as essence is concerned, but what we do know is one of his student's student, Ouspenskys student Rodney Collins, he in one of his books, celestial influence, gave a really interesting idea, to the application of this astrology to the enneagram. And for the first time, you begin to see the application of types to the enneagram -- but his was essentially astrological, but psychological. It was said that Ichazo, although never having been in a gurdjieff group, was in a region of the world, when this same Rodney Collins, was actively teaching. Collins was in mexico teaching for most of his time, he even died there. It is not difficult to connect the dots, and see how Ichazo in some way, took some of the ideas that Collins was presenting of the 4th way and his own ideas, and mixed them together and added his own ideas, and made the enneagram personality in its infancy. But in reality, I feel he plagiarized Gurdjieff's work and Collins work, and made it fit his own agenda, but distorting the ideas and making it his own. And now the enneagram, which was a special symbol, has been made into a popcultural iconic symbol for something that it isnt even about.
Mind you, this is not, in anyway, suggesting that people can not find some meaning out of the enneagram personality stuff... or that it cant give some interesting observations. just that it is important to know the history and where things actually come from. Gurdjieff himself, didnt invent the enneagram, he too got it from somewhere, but its existence in the west, is solely his own and since we dont know where he learned it from, what we do know is that he brought it and introduced it. This is the sort of thing that happens to nearly everything, and its one of the reasons why I believe this has occurred with every religion known to man. If it happens in contemporary times, it happened before.