Funimation wants shows that will have a popular Nico Nico Douga utaite singing the opening/closing theme song because a lot of people were very impressed when Piko sang the opening song for Binbougami Ga! (a show that Funimation has the rights to). Now, they have Tokyo Raven, and coincidentally, Gero sings the second opening theme song for the show.
Funimation spent too much time on Nico Nico Douga. I spent too much time on WordPress.