5D Individual or Social Memory Complex

[AnthroHeart]

In 5D it is said you can choose to progress as an individual, or as a social memory complex.
Wouldn't being part of a social memory complex yield faster spiritual progression?

What's the benefit of going through 5D as an individual?

If you start life as an individual, can you choose to join a social memory complex during your life?
Or do you need to be born into the complex?

If 5D is really magic, then I can see the desire to go at it alone. I'm an introvert by nature.