Christine,
You are right in the information being abundant out. The wild behaviour is different than that of a Grey bred and raised in captivity.
From all the experiences I have read from Grey owners, they don't ALWAYS switch their love to another when they mature. In fact, in most well socialized Greys or single owner Greys, they go on through out their lives happy and content with one another.
Their just is not enough data out there to place much confidence in what all the websites seemingly "parrot" or plagiarize from one another, thus just magnifying the amount of dis-information.
That's what makes a Forum with experienced Grey owners such a valuable life line for facts and experience from multiple sources, rather than one.
So far, Dayo (CAG) has proven many of the myths I was so worried about, wrong. It does not mean their are not Greys that display the attributes written about by some, but it does prove they are not an absolute nor a "Norm".
Now, thats just my opinion, but I still call some of the common statements out there "Hogwash"
Like my signature states, consume my opinions like a Watermelon.... :-)