I have waited so long to lay out this theory of mine because it
would take so much time to find and cut the pics from the manga
in order to back it up. However, I have finally taken that time.
So, I will first lay out the theory, then I will attach the pics I've
cut so that you can see what I'm talking about. My disertation
of the Mangekyou Sharingan:
First I will say that I believe that all three (Itachi, Kakashi,
and Sasuke) have obtained the MS. I also believe that Sasuke
first used a lesser version of the MS on Sai when he first met
him, and was getting ready to use the advanced version of
the MS (the one with the special wheel) on Team Kakashi right
before Orochimaru stopped him.
Now, just because I took the time to cut the pics, we'll look at
the 2 ativated Mangekyou's.
Itachi's to the left (ch223_p02) and Kakashi's to the right
(ch276_p04)We've all seen this activated into their special
techniques (Itachi's Tsukoyomi and Kakashi's crazy
disappearing portal). However I think the special wheels
only appear when they're using those particular techniques,
but I don't believe it is limited to them. Kakashi did refer to
his eye as the Mangekyou, too (ch276_p04).
To me, it appears as if the difference in the sharingans lies
within the thickness of the line surrounding the iris. Have a look:
First notice Fugaku's eye (ch220_p16). Now, he's been using his Sharingan for some time.
Advanced beyond other users, and
yet the lines don't seem to quite connect the full circle.
Now notice Itachi's eye before he obtained the MS (ch220_p05)
And Itachi's eye after (ch222_p19). The after pic is the day
after Shisui was killed and the first moment in which Sasuke
noticed a "different kind of Sharingan"
Now notice Kakashi's before (ch142_p13) and after (ch257_p09)
pics. The before pic is from when he fought Itachi the first time
and he knew right away that Itachi's eye was different (and
dangerous). The after pic is from the rescue Gaara arc where
they fought the clone of Itachi. This pic is the moment in which
Kakashi unveils his new eye to Itachi and Itachi showed immediate surprise
(what you were talking about before with
the eyesight deteriorating).
There are also instances where Itachi has his Sharingan but he
is obviously not using his eye powers yet and then his eye seems
to revert back to the shallow lines. Such as when he first saw
Kakashi's new eye.
Now let's take a look at Sasuke's eyes.
First we have his undeveloped sharingan, the one with only 2
tomeos (ch227_p06)
Here is a pic of Itachi and Sasuke side by side with Sasuke's
undeveloped eye (ch146_p05). You will notice it's a little like
Fugaku's where the line is a little darker but not quite connected.
Next, we have Sasuke's fully developed Sharingan (ch229_p18).
He obtained this during the fight with Naruto at the Valley of the
End, but it was before the time skip (which is when he would have obtained the MS if he, in fact, did so)
Now, we have a pic of Sasuke's eyes during his first meeting
with Sai when he used a very powerful Genjutsu on him without
even a bother (ch300_p16-17).
So, I believe there are different ways in which to use the
Mangekyou Sharingan and we only see the special Kaleidoscope
wheels during the special techniques.
Thank you, drive thru...
PS (I tried to edit the pics to be smaller, but I wasn't having
much luck. Sorry to those that struggle)
...
Vom 4. Hokage weiss man bisher nur dass er die Haare wie Naruto hat(te), und dass er den Rasengan entwickelt hatte, wenn ich mich nicht recht irre. Ansonsten weiss man von ihm auch nicht grad viel. oO° Bis jetzt kann man nur sehr schwer diese These unterstützen. 
Wenn ich von der Arbeit zurückkomme, werd ich mal das Kapitel nachlesen... ich kann mich wirklich nicht mehr daran erinnern *kratz*
^^ aber die seite ist verdammt gut ^^ 
Steht auch ganz am Ende der Folge.
