1 - In 417, Sasuke tells his team that he doubts he will be given the 8-tails, so he does not believe the bijuus will be split among members (begings in bottom of page 7)
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2 - It may be the power to control amaterazu, but I guess he's speaking about something new.
3 - Sasuke got almost killed twice. Killerbee may not have powers of his own, but he definitely knows how to control the 8-tails.
4 - No idea, plus the 8-tailed beast says he lost "several limbs" not only one. (bottom of page)
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5 - I always kept wondering if Sasuke actually knew that was not the real one, or if he was unable to use his SHaringan as he was feeling exhausted from almost dying twice.
But the fact a clone is made by a tailed beast does not matter, Uchihas can read that. In fact, when Sasuke fought against Naruto, he told him making clones was useless as he could read who the real one was.
Madara: I wonder if he just changed his mind, but the statue is not summoned, it is in the Akatsuki hideout.
Watining for Pain: the ceremony is shorter when there are more members. In previous ceremonies, when Itachi was alive, all of them were there.
But he may have refered to wait for Pain in order to unleash all the beasts with the 9-tails. The 9-tails is said to control all of them.