Okay, lets do this the powerlevelfag way then.
Zamasu weaker than Manga Trunks = Probably SS2 Level.
Super Saiyan Rose is about unmastered SSB level with actual divine Ki.
So a Potara Fusion of A SS2 and a SSB
Mastered SSB somehow beating that makes no sense, because where the fuck is the Potara boost at all then?
SS3 Goku and SS2 Vegeta went from no-chance against Buuhan to dominating him at just Super Saiyan because the Potaras were so stupidly strong.
Yet Mastered SSB > SS2 + SSB + Potara boost?
Both the Manga and the Anime are full of shit.