Basically, episode 5 of Mawaru Penguindrum chronicles Shom’s attempts in trying to take the active role which ends in comical dismal failure. While it looks like it Shoma won’t be taking the active role any time soon, I personally think that relegating Shoma being the passive one between the Takakura brothers in the meantime is a good thing.
Relegating Shoma to the passive role nicely helps the narrative. If you watch episode 4, it is being hinted that Shoma is being some sort of paired with Ringo. Shoma’s struggle in taking the active role parallels with Ringo’s quest to have her “set plans” lead to her perceived destiny. If you look at episode 4 and 5 from another angle, Shoma is being able to take “initiative” more when he with Ringo than he is with Kanba (diving to save Ringo and giving CPR to her in episode 4, Confronting Ringo about the penguin hat in episode 5). Also, by Shoma being paired more with Ringo than with his brother Kanba, it allows Shoma to have a grand end in his struggle to take the active role.
In all of Mawaru Penguindrum’s characters, it is in Shoma’s character development that I am truly interested in because his particular character development in the anime that must be handled with care in my opinion. Mawaru Penguindrum has me real hooked.