obito told Sasuke that Hashirama had them all at one point before passing them out. Madara subdued all nine bijuus simultaneously....with rinnegan......
Hashirama took on Madara and the full yin-yang 9 tailed beast.
I know Hashirama ain't got shit on Goku, but damn he was lil too damn strong.
Obito told Sasuke that he had several bijuus.
In the meeting it was revealed that the sand had shukaku, while Madara had kurama.
Hashirama had seven.
Madara had the rinnegan, but Obito threaten the kages with seven bijuus too, and minato has taken on a full yin yang kyuubi as well.
He's strong but not as strong as you think.