ok.... Im about to go in hard and crush some of you obsessed fans hopes!
there is no such thing as "full power itachi", outside the edo tensei itachi (considering he is dead and kabuto gives him more chakra if needed).
the reason why i bring up this is because ppl say if he was younger he would be "blah blah". But in actuality if he were younger he wouldnt be half the ninja that fought sasuke to begin with! think about it..
he was around 18-20 when he took out his clan thanx to the help of shisui and tobi. and as seen with other Ms users, you dont automaticly unlock susanno, amateratsu, and tsukuyomi right when you obtain the Ms. No matter how obsessed you are it is the truth. let alone master everything asap when he gets it!
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even madara at a young age was losing his vision and what not. but it would seem through out the years itachi had the plan to die by sasuke so he was smart not to over use it like madara and sasuke (sasuke went blind in 3 days it would seem.lol).
and being a true genius of the uchiha i wouldnt expect anything less from itachi. And it was just a added plus that he obtained the yata mirror and that spiritual sword as an added bonus in his arsanal. but when ppl say if he was full power he would be the best, but that makes no sense considering his "full power" is when he has "fresh eyes". and when he had fresh eyes he did not have susanoo or full mastery over his ms techs let alone the sacred weapons he had. as you obtain power you slip into the darkness so in a sense its a double edged sword! as in your techs get stronger but your health and well being goes down. get it?
if anything what itachi showed to us (besides shisui's eye), is and was the full extent of his abilities! and to think otherwise is foolish! yes we know he could of killed sasuke not talking about that, im talking about that was itachi in his prime considering before he died he obtained everything he wanted to do before he let sasuke kill him...
so stop saying, "if itachi was full health" or "full power itachi". that doesnt exist in the "alive" itachi! not saying he is weak or anything close to that, but that your either fresh with weak and underveloped ms techs or your weak with powerful full mastered MS techs... and its just that simple!...
p.s. im a huge itachi fan, but you hardcore no life itachi fans need to wake up! he isnt the best and is no where close to being the best!