Aiko is too much of a Tsundere to be a flirt. 

Also, I meant more along the lines of "If Kakashi's Sharingan wasn't the only thing in the world that could reverse Obito's techniques". Not if Kakashi didn't have the Sharingan at all. Like, if they were to fight, equally, with neither of their abilities related to each other, Obito would have won. But the whole "connected dimensions" is what gave Kakashi the ability to fight Obito. It wasn't because their skill level was equal, but simply due to coincidence and circumstance.