Well, madara's PS did display such power(power to rival the bijuus). We should debate about what bijuu does it equal. It might be more powerful than the hachibi, maybe it equals 100% kurama, maybe it's below kurama.
I think that by feats madara's PS is close(a little above) to 50% kurama with perfect jinchuriki, we saw naruto BM fighting 5 bijuus at once. We should get to a conclusion fast.
Guess my bullet totally missed...