Evolving beyond need

Q) -- How evolved does a spirit have to be to not have to come back to earth?

A) -- How evolved is totally up to you. Back to earth depends on the karma you collect, your progression through incarnational cycles you set for yourself, and your higher-self's goals within the context of the method of achieving them. Out side of that nothing is withheld from you other than that which is outside of your state of being. How you experience and understand yourself has always been up to you. There is no right or wrong in this but that which you set on yourself.