Yeah yeah, the image is clichéd, but it proves my point! <><><><>
     Some may believe the Black Rose arc is insignificant, but within it lays subtle hints and connections to the outcome of the later Utena series.  The main evidence of this lies in episode 15, "Landscape Framed by Kozue."  One of the early scenes includes one of Mikage and Mamiya's signature stances, Mamiya leaning over the rose drying tank and Mikage, turned away, deep in thought.  In this scene, "Mamiya" suggests Mikage's future duelists should have ties with the Student council.  Since, as we find later in the Black Rose arc, Mikage's vision of Mamiya has been played by Himemiya, this leaves one to wonder.

     During the course of the entire Utena series, Himemiya is being used as Akio's tool, never refusing to leave her beloved oppressor.  She remains due to the simple, yet tragic fact: she loves Dios so much that she has latched on to the manipulative being he has become.  What makes her continue to be willing to be controlled is her ongoing love for Akio himself, with all of his affection.  She is observant, intelligent, (and above all, useful) but she seems to be blinded to her own needs.  Thus, she allows herself to remain with Akio.  (An interesting point to note is though many dislike her, numerous individuals often become trapped and manipulated by those who supposedly love them.  In the course of this relationship, the victims are often driven or forced to betray those who truly love them; stab them in the back, in a manner of speaking.  They remain in the relationship, somewhat blindly, until it ends on a bitter or violent note.  At that point, they become either disillusioned, hurt, or dead, just as Himemiya was disenchanted from Akio at the end of the Apocalypse arc.)  As she perfectly proceeds towards her purpose, she and Akio gather the poor souls of the Student Council to fulfill their desires (therefore perpetuating Akio's desires) by dueling.

     Anthy, as Mamiya, proposes Mikage's targets to be associated with she and Akio's own victims to lead the Council members further into Akio's vast web.  Their methods intensify as the series continues, in the Seitokai arc, all the council needed was evidence of the End of the World's, as well as their wishes', existence.  However, later in the series, they began to need actual proof, rather than simple evidence, hence Akio taking them to "The End of the World" and showing their wishes as they would be if they completed the revolution for themselves.  Therefore, the tribulations of the Student Council must be perpetuated in order for them to feel the urge for their own revolution.  The manner in which Anthy and Akio operate is to build Utena's skill (in preparation for Akio's attempt to break her spirit by seducing her) by sending the troubled members of the Student Council to the dueling arena, challenging Utena.  In order to successfully carry out Akio's plan, the council must remain troubled.

    The suggestion by "Mamiya" is evidence of the indirect manner of allowing the Student Council to remain plagued.  Firstly, they prepared Mikage for this sole purpose.  (Keeping him within the garden of childhood that is Ohtori is similar to sending fine wine to a cellar for aging; it becomes more useful with age.  Once its purpose has been determined, the owner of this wine chooses the perfect time to utilize its potency.)  Once the path had been prepared for Mikage to believe his actions would further his own mission, to give eternity to the one he loves.  In actuality, the action had been for Akio's cause, to accelerate the duelists' issues through the interference of those who will perpetuate their Unfulfillment.

     During the Akio arc, outside influence became more obvious in order to draw the duelists closer to Akio.  New hands were used to control the pawns, such as Touga, with no purpose but to impress Akio as well as inflate his own ego, or Ruka, who seemed to reluctantly accept for Juri's sake.  Ruka's time was short, but he could not bear to see his love being slowly destroyed by a fool.  Such is why he was taken in.  Whether or not these "puppet-masters" had fair reason to intervene, Akio's will had been imposed greatly upon Ohtori.

     Mamiya's simple suggestion contains much evidence of Akio's influence.  It reached from Mikage, to the Black Rose duelists, to the Student Council members, to the prominent target: Utena.  The way the Black Rose arc ended and the commencement of the future chronicles of Utena proves this thoroughly.  Mamiya's proposition alone begins the development of a pattern of influence that continues until the Revolution.