If memory serves, I recall a similar request popped up a couple of years back. At that time, it was decided that only those in the Beatles camp/inner circle/whatever you want to call it, would be included.
It makes sense to me, because where will it end? It's nice that Taylor/Donovan/"insert Beatle friend name here" were chummy to a point, but so were a lot of other people. Paul played drums on a Steve Miller song after a heated argument with J, G & R. He also appeared on Paul's album Flaming Pie. Do we include him as well? Were any of these ...