Firstly, is it OK for (D) and (J) to be in the Astral Travelling group and if so does the same advice apply to them?

Hello (M) this is Thomas.
Tell (N) to keep all options open, nothing should be set in stone, We are learning, you are learning. Anyone who is interested keep them in the know, you don’t want to be elitist. It is good that interested parties are Meditating well and to be aware of any new things that come up. ie. different landscapes – feeling head adjustments, anything out of the ordinary. Write it down for future reference. Record dreams as they will be significant – to do with other worldly phenomena.