Board Thread:Naruto Discussions/@comment-5108618-20141103215752/@comment-3472551-20141106195701

Deathmailrock wrote: You know, I'm not surprised by Kaguya's position. Even though she's the 10 tails she wasn't actually shown in her true form for that long and for the majority of the series, we believed Madara to be the real bad guy with the 10-tails just being a tool... Kaguya was the hidden final boss that wasn't hidden.

Madara was the actual villain who moved things along with Black Zetsu's help. Others might have had the desire, but very few had the will that Madara had.