uhhh Edo Tensei isn't the only jutsu/skill Kabuto had. He also had SM, sound ninja techs, regenerative ability, ect...Even without Edo Tensei I'd say Kabuto is easily top 15 or so.
How many other ninja can dodge a susanoo arrow? Kakashi is relatively fast and he was forced to use kamui to avoid being hit by it. Probably the only ones who can dodge it are Naruto, 4th raikage, Minato and possibly SM Jiraiya.
SM is very powerful. There's only 2 others who have sage mode and thats Naruto and Jiraiya, and with SM they are top tier ninja. Also, it can be argued that Kabuto's DSM is more powerful than the toad sage mode Naruto and Jiraiya have.
Just re-read the the Itachi/Sasuke vs Kabuto fight. Edo Itachi had limitless chakra and Sasuke EMS, but they had a hard time with him. Itachi pretty much had no choice but to use Izanami. If Itachi wasn't an edo, Kabuto very well could have killed one of them, or both.
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Right here Itachi saves Sasuke's ass. If Itachi wasn't an edo, one of them would have died.
I always see people saying "well they didn't have killing intent" So? I'm prerry sure Kabuto wasnt planning on killing Sasuke(see the above page where Kabuto says "I'm not going to hurt you though, you are my guinea pig") and Itachi couldn't even die...