Madara had control over it at the time and Mito sealed it in herself becoming the first Jinchuriki of Kuramanow i officially believe that kyubi helped hashirama on that battle. Since kyubi originaly a good biju.
Susano has legsMokuton can pull him out of the Susanoo.
Hashirama took Kyuubi under his control and with it's help beat Madara.
Madara didn't had Rinnegan.