Still, being a maverik leader he is impure in his system.

Well sigma cannot use his ability of when he is a huge machine in his small form. Also, his temp invulnerability are always in huge form and like i said in this level in his huge form he would be quite useless. So if he use his big form he basicly lost the match without giving me any effort . So quite a few of those attack are useless. The Purple Blast and Purple Energy Field that are again in a big form of sigma are virus type attack. So me and the nova dragon not being mechanical render the attack useless.