Well I mean, the Tailed Beasts have been working together for a fucking WHILE now. The show just touched up on this like 2 months ago.
All I know is, Madara is truly a crazy mother fucker, god dammit. I can't wait to see how this cynical bastard and his "plan" plays out.
I also liked the Gaara/Shukaku "wrap-up" too, that was needed and was well done too.