Re: Thought about the Konha attack.
pls don't give kishi more explaining i wanna see naruto and bee vs madara :S and what is in the scroll, damn you...
anyway I suppose it wasn't the right time to start collecting the tailed beasts, as you might have seen it seems like they need to time it for a certain day, hints have been given in the manga, and am not gonna find it now, but Madara lately said that Obito was too hasty and that they still had time to extract the remaining 2. Also hints have been given before these, but hard to explain
he probably attacked to measure his own capacity and to learn how to control a tailed beast. I mean Madara probably made him do it, and I am sure we will see this flashback as well. It was probably also to get rid of Kushina, since a strong host would be a problem later in the story - even for akatsuki.
Might also just have been a test to provoke a war, if other nations found out they might have taken advantage of it.. who knows..