A lot of possible answers for the true identity of Pain; Jiraiya said the real Pain is´nt among the 6 bodys he saw, so maybe Yahiko was killed, and Yahiko tried to bring him to life with this 6 Pain bodys.
Nagato, the real Pain, mastered the 6 chakra typeat his 10 years, can see all his country with his rain and control 6 body enough powerfull to kill one of the sannins: This may be the real final boss.
In the image, Nagato is holding Yahiko´s body, this is the scene: Naruto fighting versus Yahiko, finally uses his nine tails to defeat the last akatsuki, and when Naruto is ready to give the final attack, someone saves Yahiko... Nagato.
I tried to make him look more mature, but now he looks like a character from final fantasy movie and a punk singer ¬_¬
Wait for more scrap ideas for Naruto