Sounds like it's confirmed: Momo and scabbards defeat Aramaki without Yamato.
This makes sense plot-wise because:
- Parallels the people of Dressrosa protecting Luffy from Fujitora
- Reciprocates the minks not giving up Raizo
- Lets Momo and scabbards finish the arc with an actual solid W
- Shows that Momo can lead and defend Wano