I really want to see these 9 girls perform the older songs that aren't/haven't been used in AGES by these girls to see what they're capable of. Sure, the songs aren't gonna be as good as the originals or even past lineups, but I think that's my favorite part of these concerts MM does. The lineup is ever changing, so we never see the same songs done the same exact way. Now that Miki and Yossi are gone, the lineups are still gonna be waaaay different.
We haven't seen their first few singles in the longest time. I really hope they don't do their latest singles, and maybe stick with the past stuff. Or make like two medleys (the one they already have made! The Golden Era songs), and do half songs and such. The only singles they've done with this line up out of all 35 singles so far is the two most recent singles, Kanashimi, Sexy Boy, Shabondama, Go Girl, and Ambitious. I can't really picture Mr. Moonlight with this group, though

Takahashi would be one of the choices, but the last time she did the song, she then got kicked out of that lead and was replaced with Ogawa (which was the wiser choice)

If they had to do the song, though, I think Takahashi, Niigaki, Junjun, and Mitsui would be fine as leads. The other five wouldn't do so well

I do agree that this group would be the weakest ever doing the older songs and doing them well, but all I've ever seen them perform lately is the newer songs or ones they've never performed before, and I'd like to see them do a different style than their used to.