I think songs from Diana's solo career at RTL was because this wasn't a traditional reunion tour. It was quite literally Diana Ross...and special guests, the Supremes. So a mix of cuts from her entire career makes sense. Had Mary and Cindy been on the tour, I find it unlikely, although not impossible, that the show would have been anything other than Supremes songs. I don't know about solos, but I would assume Mary would be given a couple of leads. Of course that would mean Diana would sing backup and I'm not sure how she would have handled the suggestion.
Mary: Okay Cindy, Diane, while I'm singing lead, y'all do the backup.
Diane: No. I don't do backup.
Mary: Oh come on Diane. It's just a few oohs and aahs.
Diane: I don't do oohs and aahs...unless it's "Baby Love" or "Aint No Mountain High Enough", both of which I sing lead on.
Mary: Fine. How about we do "Endless Love"? I'll do Lionel Richie's part."

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