Board Thread:Versus Debates/@comment-31074250-20170318174309/@comment-30426414-20170409183753

1. Hagoromo and Hamura sealed kaguya before hagoromo became the 10 tails' jinchuriki.

2. Kaguya had the complete 10 tails within her when she fought hagoromo and hamura unlike the 8.5 bijuu she had with naruto and sasuke.

3. And like you mentioned naruto and sasuke had help.

So naruto and sasuke are probably around half of hagoromo's power.