[TokuChris]

Kengo.

His inability to transform in to Kamen Rider, his inability to drive the mech, his inability to answer the questions that other members of the group are figuring out ... it's going to build up to an ultimate frustration which will cause him to end up with a Zodiart switch and use it, thinking he can control it ... and causing him to switch sides as it overtakes him and his negative feelings, amplifying them tenfold.