If the power of Goku SSJG (Vs Beerus) is 100.

[ahill]

Zamasu is almost as strong as Goku SSJ2, so tens of times stronger than SSJ3 Gotenks/Super Boo. Zamasu might be even stronger than a hypothetical Boo saga SSJ3 Vegetto.

 

[Let's Go Fearless!]

We'll just have to accept that.