@vummax: Momoshiki wasn’t stated to be stronger than Kaguya, and that was a guide book statement about splitting planets and it might not have been literal. Momoshiki should at least be country level, and could easily be moon level, but planet level is too much for now or until we get more evidence.
The scroll Sasuke got from Kaguya's Dimension mentions Momoshiki and Kinshiki specifically. Sasuke even refers to them as a threat greater than her in the Manga. And in the Anime Urashiki literally says she feared their (His, Momo and Kins) existence. And whenever Kaguya mentioned who she was afraid of in the anime their silhouettes appeared.
Also in the official Boruto anime novel Momoshiki has a Star Level feat.