Axon Z will be an upgrade in the future(not in the future AU) I meant after Darkrus is defeated and before Chaoslings started to attack and the cause of upgrade is that Axon got severely damaged by Darkrus' accidental attacks when Axon got in the way and after the defeat... Dravyn and Rusty 2.0 carried Axon to the lab and then took some pieces apart trying to figure out how to fix him and then since that an attack this big harmed Axon... he upgraded his armor to be more indestructible using a type of metal that was stronger than Tungsten which is a fusion metal known as Diamond Steel, which is tungsten and Diamond mashed together
