If the Bijuu wasn't inside him.. then he used the Senju part of his Blood aka high Chakra.
Sorry but Tsunade can touch you and screw up your whole Nerve system.. and then easily kill you. O_o It doesn't put her feats to shame. But we'll see if he really created the moon. Or just put the Gedo in there.
Lol, Tsunade messing with someones nerves is better than creating the moon? It does put her's and everyone else'e feats to shame.
They already confirmed he created the moon in 606 and 467.