Mike, did you go back over all the steps I gave yesterday for duplicate accounts on Log-in Screen, to make sure none were missed? This normally fixes the problem of a duplicate ghost listing on log-in screen.
Also if you use a Local Account during install does it bypass password using Netplwiz and remove the ghost listing, and if so what about waiting until those are done before converting it to a MS Account in Settings > Accounts > Your Info > Sign in with a MS Account Instead?