I suspect that the correlation between the horoscope and MB is strong.
I think the failure is in the reading of the chart, coupled with sparse understanding of the MB types.
I haven't researched the subject, but have looked at a few charts with that in mind....
If astrology "works"
and if MB "works"
Then....
Lately I have been looking at questions like "Is this man a psychopath?", or "Is this man accident prone?"....
The chart clearly shows these things IF WE LOOK FOR DESCRIPTION OF SYMPTOMS RATHER THAN LABELS. There are few if any specific positions or aspect patterns associated with this or that psychological type or behavior (a recognizable and defined complex, syndrome or set of behaviors/traits)....but the symptoms can be seen in the chart. Our problem, or mine, is lack of knowledge of the symptoms of what a psychiatric label implies. There is no aspect that declares This person is a psychopath, but the symptoms that the label psychopath implies are clear and easy to find in a chart; if we find the symptoms, we can diagnose for the condition.
If I find that a chart contains indicators of the behaviors and traits that are used to describe accident prone in the psychiatric literature, then I can apply the label “accident prone” with confidence and expect the full range of behaviors and consequences associated with the term. But just because a person has an accident that affects his life course does not make him “accident prone” in the sense implied by that term in the psychiatric literature.
I will try to illustrate. I did an online chart -- just one of those casual "read my chart" things -- for a man from India one night. He was in his 40s or 50s. I told him two things. First, that he tended to meet life in terms of extreme force and violence. Second, I suggested he should be self-employed. He then asked, "What do I do for a living?"....and I said "I haven't the faintest idea." He then told me he was a colonel in the Indian Army, the commander of combat infantry division in Kashmir.
Consider that. I saw the necessary elements descriptive of a military officer in a zone of conflict (symptoms). But I didn't put them together in my mind. I used the wrong terminology in regard to "self-employment"; it should have been "ultimate authority" or "self-directing," and that misled my thinking.... My mind did not synthesize the symptoms and locate the label “military officer.” It was a failure in synthesis on my part, and not a failure of the chart.
And that sort of thing is what happens when we don't have a good grasp of symptoms. It's there, in the chart, but we fail to recognize it.
The MB types are labels for more or less specific patterns of behavior and orientation. I'm quite sure the horoscope and the label will match closely if we understand these "labels" as descriptors of symptoms. In horoscopes where a marked preponderance of planets occupy Cardinal signs we are apt to find an extroverted personality; weight on Earth signs is likely to indicate a person who relies on and perceives through the senses, sensation.
I wonder how many of us here have read Jung’s Personality Types and understand that what he means by extroversion/introversion is not congruent with the way most of us think about those terms. Jung’s use of the terms refers primarily to two diametrically opposed world views which are incompatible, in fundamental conflict. The terms do not refer to an outgoing personality as opposed to a hermit, which is the popular understanding.
In terms of Jungian psychology the Water signs correspond very closely with Feeling, Air with Thinking, Fire with Intuition and Earth with Sensation. If a preponderance of one of these Elements is present in a chart, we can diagnose for the corresponding Jungian types.
I have seen many discussions among astrologers hinging on the question, "Can you see homosexuality in the horoscope?" We all know what homosexuality is, although it takes on many forms of expression, so "label" is not a big problem. And what I see in these discussions is that about half of the astrologers say, "No, you can't." But I say you can not only see homosexuality, but the basic sexuality -- of whatever sort -- of any and every person in their chart. It is there to see, if that's what you want to look at. You can see if a person is born to wealth and privilege, or if mother was cruel or distant or cold; you can see the how and why of relationship problems.......It's all there.
These things are seen through seeing the chart as a whole. To say that planet “A” in square to planet “G”, if in Common signs, indicates flat feet (in any horoscope where the aspect is found) simply does not work. Nothing in a chart -- or, more importantly, in a person -- operates in isolation. The chart and the person are organic wholes.