I think they extracted the DNA and then turned them into stone, which would make perfect sense.Also, Yoshipatrol, I think Hydranoid was the second captured, while Skyress was the first, making Skyress into the first mecha Bakugan, then Hydraanoid into the second, and then continue te cycle (most likely Elico being created, then upgraded into Dice Elico, if the dice thrower is indeed an evolution of Elico. Then Vulcan into Shadow Vulcan from Gorem's DNA, and Brontes into Alto Brontes from Tigrerra's DNA, and the extra DNA will be used to opgrade Hades into Myriad Hades, and Viper Helios into regular Helios/Turbine Helios.