Abrupt vs gradual harvest

[zenmaster]

During the fourth-density experience, due to the lack of development of fourth-density entities, the third-density planetary sphere is not useful for habitation since the early fourth-density entity will not know precisely how to maintain the illusion that fourth density cannot be seen or determined from any instrumentation available to any third density.

Wouldn't there be development of 4D entities by full activation (end of transition)?

There would be the full 4D body, but the mind is still figuring out how to use the body. A 4D body has a massive "spiritual wake" (as the higher vibration always controls or influences the lower) that can basically kill 3D if exposed over a short time. During the transition and until they learn to withdraw that energy from the local 3D environment, 4D can easily do harm to 3D.