Interesting. Green/blue is missing from negative system, but,

[Unbound]

I don't think individuality is sacrificed, ever, to be completely honest. This is a complicated idea somewhat. Even though you may eventually reunite with the One and become an integral part of it, the fact of your existence prior to this /will never vanish/. You will always exist in an individual format, it is simultaneous with your place in the One. Remember that the One is infinite, so it will have absolutely no difficult remembering absolutely every single little detail of absolutely every facet of existence. So no, individuality is never lost or sacrificed, it simply becomes a memory rather than a independent identity.

This is quite amusing, because I agree that Negativity fears this dissolution of the identity, but they misinterpret what this means. In truth, their fear is absolutely transient because they fear something that is not there! They fear the loss of themselves, but Selves are never lost, in fact nothing in this universe is ever "lost". How can you lose anything from Infinity?

I think that of course blue and green are essential for progressing in to 6th, since the 5th is blue and it must be appropriated before you can continue. Green should be achieved long before this.

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Also yes, it's supposed to be easier for an advanced Negative to switch because it has more direct control over its choice of polarity.