Umm, how could Links sword hit him, if Sephiroth is literally atleast 100x faster then Link, has instant teleportation, actual reaction time that casually can dodge bullets like nothing, while Link has zero speed feats to even suggest he can hit Sephiroth.
Even with Naryu's Love, the casting isn't instant and takes some time. By then Sephiroth would've made a gesture and the NL would crush him. Or he would've TK'd him. Or simply teleported behind him and decapitate him. Nor would Sephiroth just stand there while Link tries to play a song to slow down time, he'd instantly slice it right out of his hand.
Show me link transforming people into jello, thx.
Face it, Link is slow as shit. In terms of attack speed, he is hardly any different from a regular person.