User blog comment:BobTheDoctor27/April 2013 Update/@comment-5918010-20130517002454/@comment-5918010-20130517233414

Well, Shadoan and Scoras went on their own, and Scoras was immediatly attacked by Skrall, suffering a fate similar to Dredzek, and the machine used to generate the storm was subsequently destroyed, trapping Shadoan in in the Eternal Twilight Universe (My fanon Universe, where the only difference is that Makuta Scoras and ten other Makuta survived the Purges of Makuta.)

And as for the Shadow Toa thing, I think that if the corrupted Matoran was destined to transform ( like with Shadow Tollubo and the Ignika), they would.