"Tobi has been referred to as Mizukage by Fishface, so we know at one point he was the Mizukage, but fishface could simply have known that someone was controlling him, as we know the 4th Mizukage was controlled" - IceSlayer
1. The 4th Mizukage being controlled is a rumor. It is not a fact.
http://www.onemanga.com/Naruto/458/10/Also, who's "him" exactly? Uchiha Madara? Who can control Madara? Madara doesnt get controlled, he does the controlling.
Him = Kisame aka fishface? How would Kisame know he's being controlled?
Check this out:
http://www.onemanga.com/Naruto/404/01/Kisame was close with Madara aka Mizukage. On the next page, Kisame even called Tobi by his real name. When I look back at this now, I feel there's something more hidden to this, like another clue to Madara's identity. But yea, I dont think Kisame is being controlled.
"Also a side note, Shisui was a master of Shunshin no Jutsu, using it speeds such as never seen before, and now Tobi has his time space ninjutsu which is like a highly advanced Shunshin at first glance, and Danzo has Shisui eye." - IceSlayer
2. Shunshin no Jutsu is not a space/time teleportation jutsu. This has already been stated and what Tobi did is clearly a space/time teleportation jutsu.
Check this:
http://www.onemanga.com/Naruto/395/09/Basically if some1 were to use Shunshin no Jutsu, Shino's bug would have known which direction the person went.
Also check this out:
http://www.onemanga.com/Naruto/396/02/Does that even look like an advanced form of Shunshin no Jutsu? o.o
Also, didnt I JUST say the Madara = Danzo = Shisui theory doesnt make any sense? And yet, here you are doing it. o.o
"Danzo is thought to have controlled the 4th Mizukage, Tobi was Mizukage, if he did this as himself or through control is yet unknown, though I highly suspect it was by control." - IceSlayer
3. When I read that Kakashi wannabe's part in the bottom of this page:
http://www.onemanga.com/Naruto/459/15/"My own right eye is a souvenir of my with a hyuga so I cant judge you on that account, but my right saw the illusion placed on the 4th Mizukage, so you cant fool me, and --"
I auto-thought he meant that female mizukage but I re-read that line. I initially thought it could be a typo. Even if it isnt a typo, I re-read the line again and he doesnt really claim that Danzo was the one that placed the illusion on 4th Mizukage. He sounded like he was doing an comparison, like since his byakugan saw through that illusion, it means he could see through this illusion too.
"Now we see Danzo has Shisui's eye/whatever else, and as stated by the Kakashi wannabe, he had the power to control people, and also was awesome at Shunshin no Jutsu. The wannabe also thinks Danzo may have been the one controlling the 4th Mizukage...Danzo can control people, Tobi has most likely controlled someone" - IceSlayer
4. Technically speaking, dont all Uchihas have the ability to control ppl via Sharingan? I find it kinda weird how the Kakashi wannabe said it like it's something new. What's even more weird is that how is Danzo able to do it w/o his Sharingan visible to others? The kakashi wannabe did say it was a powerful eye technique.
5. Even if the 4th Mizukage was indeed controlled by someone it would make sense that it was Madara that did it. He was a Mizukage in the past so it would have been easy for him to do it.
Danzo's Sharingan:
http://www.onemanga.com/Naruto/455/17/Madara's Sharingan:
http://www.onemanga.com/Naruto/397/03/ ,
http://www.onemanga.com/Naruto/453/05/Danzo's Sharingan eye looks slightly damaged while Madara's is clear. Now stop with these "Danzo = Tobi = Madara = Shisui = Every dead character in Naruto" theories. >.<
Side Note - Here's the page that referred Shisui as Shisui of the Mirage:
http://www.onemanga.com/Naruto/222/07/Btw, most likely his shunshin was so fast that it left an after-image of himself, hence the "mirage". At least that's what I think.