Going to fourth density? Or fifth?

[Tenet Nosce]

Let's take a closer look at these quotes from Session 6:

6.15 Questioner: What is the length, in our years, of one of these cycles?

Ra: One major cycle is approximately 25,000 of your years. There are three cycles of this nature during which those who have progressed may be harvested at the end of three major cycles. That is, approximately between 75 and 76,000 of your years. All are harvested regardless of their progress, for during that time the planet itself has moved through the useful part of that dimension and begins to cease being useful for the lower levels of vibration within that density.

Notice that they say "useful for the lower levels of vibration within that density." Sounds like they are talking about sub-densities.

6.16 Questioner: What is the position of this planet with respect to the progression of cycles at this time?

Ra: I am Ra. This sphere is at this time in fourth-dimension vibration. Its material is quite confused due to the society memory complexes embedded in its consciousness. It has not made an easy transition to the vibrations which beckon. Therefore, it will be fetched with some inconvenience.

What they actually say here is "fourth-dimension vibration." In the previous quote they were talking about the levels of vibrations within a density. Therefore, it stands to reason that in this quote their use of "dimension" does NOT mean "density" but, again, a sub-density.

6.17 Questioner: Is this inconvenience imminent within a few years?

Ra: I am Ra. This inconvenience, or disharmonious vibratory complex, has begun several of your years in the past. It shall continue unabated for a period of approximately three oh, thirty, of your years.

Until the sphere enters the fifth-dimension vibration (or sub-density).

6.18 Questioner: After this period of thirty years I am assuming that this will be a fourth-density planet. Is this correct?

Ra: I am Ra. This is so.

Don asks, "after this period of thirty years". Which is where we are getting the idea that 2012-ish is the transition to fourth-density. But notice, that he didn't specify HOW LONG after. Immediately after? Another thousand years after?