>>it's an obvious evolutionary advantage to have a sense of me- ness<<

Sure. If "I" didn't feel hunger, "I" wouldn't eat which would eventually destroy the mind-body complex. If "I" didn't feel pain or have a sense of "me" I could simply chew my own hand off and swallow it. "I" am a correlator of sense-data. "I" put it together and react accordingly but it isn't "me" that makes the decision to react. "I" think "I" made that decision but the brain "pinged" me to react but I'm not conscious of the workings of my own brain--none of us are--otherwise "we" would get lost in our own brains and ignore the external world altogether. Imagine being conscious of the billions of things that occur in the brain every second. You would become preoccupied with it and conscious of little else. When organisms combine, a mind or consciousness simply forms as an overall correlator whether it be ants or bees or billions of little cells all bonded together.