First off: Hilarious Minato/Kushina picture. I've thought of that exact scenario before... the "fastest ninja in the world" paired with the chick with the highest stamina can only lead to suffering in the bedroom, but at least
Naruto's got the makings to be a real
stud when you combine the two.
Second, I think space/time may be linked to the Sharingan for several reasons. The bending of time/reality seems akin to bending the form an object takes, not too different from how Genjutsu can alter one's perception of reality. Tsukuyomi forces the victim to experience multiple days' worth of suffering within a brief moment. Sasuke was able to take control of Orochimaru's alternate dimension by using his basic Sharingan genjutsu. Even the nature of the Sharingan's enhanced reflexes can be seen as experiencing "time" on a different level than everyone else... the Sharingan users literally see the opponent's movements before they happen.
I think the Sharingan's powers over Genjutsu, which are based on altering one's perception of reality, stem from the essence of all spiritual energies in the Narutoverse, providing a concept and design out of imagination. Space/time jutsu, which bends the laws or current state of reality, must also be heavily based on spiritual energies, although unlike pure Genjutsu it has actual, physical effects on reality. However, the Sharingan is the only tool that can perfectly synchronize Genjutsu with reality, giving it a vastly superior control over space/time jutsu as well.
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