I had thought Tobi waged war so to capture Bee and Naruto to extract the 8 and 9 tails. If the chakra from the Gold and Silver brothers will suffice for Tobi's purposes, why did he wage war with the Allied shinobi in the first place? Why? Tobi could have easily had Kabuto revive Ginkaku and Kinkaku to use them for his purposes without going through this hustle, especially since the war so far hasn't gone well for Tobi.