This is actually something that has traditionally been part of Astrology for a very long time, but is often left out. Obviously Aquarius is going to have a closer relationship with other water signs than the other two air signs would, and Sagg is going to be closer to Aquarius (symbiotic relationship between the atmosphere and lightning) than the other fire signs are especially Aries which is earth fire. Looking at the specific forms of the elements can sometimes help describe the differences in personality. For example, Taurus is the most rigid and stable but dont bend or adapt as well. Capricorn is slightly more flexible for an earth sign. Leos like to be the center of attention, and are represented by the Sun. The Ocean is tied the Moon which rules cancer. Jupiter goes back to Zeus which rules Sagg.

Its a pretty interesting world view they came up with.

Some of those sort of make sense to me, but others dont.