Harvest - Instantaneous vs. Long Term

[anagogy]

Forgive me as this is slightly off topic. Please move this to a new thread if it significantly derails.

This creation will be gradual and will take place beginning with your third-density type of physical vehicle and, through the means of bisexual reproduction, become by evolutionary processes, the fourth-density body complexes.

I never really thought about this before, but logically where does the fourth density body come from? Obviously, if two third density people reproduce, they produce another 3D entity. So what is the mechanism that 4th density beings are born? I don't think 4th density beings are going to just come and breed with 3D entities (that would be weird, IMO). My theory would be that if a 3D being became 4D harvestable (mentally and/or in polarity), if they bred with another similar being, the resulting entity would be slightly more 4D physically.

It just seems so odd to me how that works. If adding 1+1 and getting 2 is analogous to two 3D beings breeding and getting a 3D being; its like if during the transition between 3D to 4D, adding 1+1 gets you 3 instead of 2. Hopefully my analogy makes some sort of sense.

It starts off with the dual activated beings reproducing, so you begin to have this race of individuals who are dual activated having children that are slightly more 4D than 3D, and eventually, the 3D part is discarded in favor of the 4D body altogether.

Voila, you have your fully 4D terran human.