Zoro's Asura form debut in Enies Lobby was to represent each of his crew members turning into a sword. Luffy, Nami, Usopp, Sanji, Chopper and Robin were the crew members at the time of Enies Lobby. These six were the six extra swords that appeared in Asura. This idea might've been hinted at when Sogeking was used as a sword when handcuffed to Zoro.
Zoro stated his swords are heavier than Hatchan's 300kg cutlasses back in Arlong Park, this could mean something completely different since the two swords he used at the time were from Yosaku and Johnny. Tatsumaki was also debuted to defeat Hatchan. this is also an attack closely similar to Kaidou's own attack. I think Johnny (J-Oni) is a clone of Kaidou. Kaidou by himself is worth at least four plus Hatchan swords in weight, and in his dragon form he obviously exceeds the 2 ton weight of the 8 cutlasses of Hatchan. If Yosaku is also a clone, then I'm just going to assume all the weight talk is directed towards Kaidou and Johnny's side. If this revelation is true, then the likelihood of Zoro possessing a sword that ate Kaidou's fruit becomes increasingly more likely since Oda said Zoro would have it in a hypothetical question in the SBS.