Head or Leader of Akatsuki?

According to this site,
http://aestusimmortal.proboards46.com/index.cgi?board=naruto&action=print&thread=1154512379

There are 3 theories about head of Akatsuki.

1. Yondaime/the 4th

2. Uchiha Mardara

3. Uchiha Obito

But, what do you think if i say that the Head of Akatsuki is Sarutobi/3th Hokage?
Maybe Yondaime or Sarutobi? I guess Sarutobi is the Head of Akatsuki. But no clear evident about this theory, so we will wait until it reveal.