Well, I think it does actually fit but when looked at properly. The Majors are ordered not haphazardly but according to the scheme of the classical planets as derived from the Sepher Yetzirah, although some changes were made. The other cards derive from this scheme and are drawn from it.
It ultimately does work but only when the Kabbalistic context is understood. As Barleywine said aptly in the other thread, there is little connection between the astrological attributions and making a classic horoscope. These attributions may not be immediately apparent in the intuitive sense, but they do absolutely make sense when considering the bigger picture and not, as again Barleywine said, "cherrypicking" here and there.
For example, many people have trouble with something like the Cancer/Chariot connection, because it does not make immediate sense. In truth it really is difficult when you consider only the personality attributes of Cancer, but it becomes crystal clear when factoring in the greater systematic "need," and then you realize that the Chariot must be Cancer and no other. I won't go into it now, but it can be explained quite easily.
Remember that the GD system is just that, a system, hence in order to get it, it must be considered internally, according to its own rules.
In addition, as far as I know, the Holy Light merely uses a different Tree of Life, hence its attributions are different.
