Yes he can, Itachi is higher than kage level. Chiyos knowledge doesn't help her the slightest she gets negged anyway, kimimaru also. Nagato is already sealed by totsuka. 3rd raikage and muu would get defeated. He wouldn't fight alone against Obito, it would be him Naruto, kakashi and gai. They would defeat him with ease before he can summon the juubi.
That's why I said all other Edo's were sealed then named the ones sealed who are skilled/strong enough to beat Edo Itachi. It would be Chiyo and Kimimaru together since we saw them fighting together and yes info that she has can help since info is power. Chiyo would fight using her puppets while Kimimaru can turn the battlefield into all bones and move through it, Itachi can see him in the bones since they're made from Kimimaru's chakra as well. It wouldn't be neg at all mid at best and can be high depending on how well they execute their plan, they can't win due to neither showing to have sealing jutsus but they can give it the fight of their lives.
It took Naruto, Bee and Itachi to take a controlled Edo Nagato down, you said Itachi can go take out Edo's that's not the case if he needs help from other ninjas is it? 3rd Raikage is too fast to be caught by any genjutsu and Itachi isn't fast enough to hit him so no I don't see Itachi beating 3rd Raikage. Edo Itachi would run out of chakra before hitting 3rd Raikage with anything to put him down and 3rd Raikage 1 finger Attack and speed most likely have him breaking through Susanoo from the back and cutting Itachi in halve. Muu is a sensor, can fly, can go invisible and can use wind, earth, fire, and dust release.
And how would they beat Obito with ease when KM Naruto, BM Bee, MS Kakashi, and 6-7th gate Gai couldn't do much? Obito wasn't even trying to kill a Naruto and Bee but seal them, he could have killed Kakashi when they fought 1 on 1 the first time but threw him in Kamui. Obito has Madara's fan that reflects attacks back at you plus the 6 paths Edo Jinchuurikis and Edo Madara later shows up as well. Obito can pull out souls, he was going to do it to Yamato until Kabuto said his truth serum and Obito's Sharingan should be enough so they can use Yamato to powerup Zetsu.
In your dreams, Alive Itachi who is stronger than Edo Itachi is Kage level, he can be beaten by Kage level ninjas such as Jiraiya, A, Oonoki, Gaara, Orochimaru, MS Kakashi, Gai, SM Naruto, MS Sasuke, Mei, Gaara's dad, 3rd Raikage, and Muu. Above Kage level ninjas are Minato (beat 2 strong Kage+ninjas alone), KM Naruto (split his power 1/13th and had 1 clone capable of fighting Kage level ninjas such as Edo Muu, Edo 3rd Raikage, and a little Edo Madara while Naruto fought Edo Itachi and Edo Nagato one at a time as he switched with Bee through the fight then used his KA to free Edo Itachi), and EMS Sasuke. Then the level after that is BM/BSM Naruto (fought evenly with EMS Sasuke with roughly half his power) and Nagato. Then after that level is Tobirama, Madara and Hashirama.