Erick, like a good jungian analyst, it is fair assessment that legends of counterparts in union (heiros gamos, attaining samadhi, etc) are described by almost all civilizations or religions, our collective mythological historical psyche, thousands of years before the 70s, perhaps even before the advent of marriage itself, wherein god is known as the male and female unified, alchemized, even androgynous or hermaphroditic. Some have a hard time consolidating such ancient spiritual figures back in to the framework of modern society—what for? And yet here we are studying astrology
Those few without uncertainty on meeting their twinsoul have faced god in a way that can only be of god, and do not live to forget it. As simple as that.
In synastry, Vertex opposite Vertex (within 3°) is a twinsoul aspect. Granted, most will not be able to locate the sensitivity of this aspect. Additionally, safe to chance, if you as an astrologer are unable to receive exact birth times to the minute/second (doesn’t matter if you’re separated), certain information may not be meant to establish. The universe gives you everything you need for your journey.
My case rests that twinsouls are not about romance. Yes, as humans we experience pleasure and pain, but what connects them aren’t these earthly principles.