The wrinkles are distinct, and so far only two people share that same pattern: Tobi and Mifune. To me this is reason enough to make a plausible case that Madara/Tobi is the leader of the Land of Iron.
Think about it tadpole,
Madara does not care about the destruction of Konoha anymore, that has been accomplished. If you guys look carefully at the whole story line, with respect to Madara, his main objective has always been War. He does not want peace to remain between the villages, period. What is the best way to make sure the villages fight each other again? Remove the balance of power by taking away each village's Bijuu (Akatsuki has done that). But then why would Madara leave Konoha's bijuu alone? well he tried and failed. Right now i think the moon plan or whatever is in motion. He wants Konoha to be the leader of the alliance. Why? Easy. Have the only country with a Bijuu dominate those who do not, Konoha will be in a position to DICTATE terms and this will cause much hate jealousy and mistrust.
This is exactly what Mifune is doing. He is getting everyone to form an alliance where the only country with a Bijuu is the leader i.e Konoha. Who is the leader of that country? Danzo. Danzo is a power hungry person, who is sly as a fox, and his ways are tyrannical. Making him leader is the best way possible to foster the seeds of mistrust and hatred between the countries and start another great war. To me not only does Mifune and Madara have the same wrinkles, but their aims coincide as well. I could be wrong, but don't say i havent thought this through.