I find it very difficult to hear Cindy on any of the songs. With the Mary, Scherrie and Cindy blend, Cindy always seem to disappear. Susaye definitely was added on I don't want to loose you. On the Terrana mix she has even more background vocals.

I think Cindy is on most of the tracks but her voice is just buried underneath all the other vocals. I can hear her on Don't let my teardrops brother you. Especially when they sing near the end "when she's what you want". Definitely not Susaye as her voice is more distinctive.