I'd just like to clear a few things up here for ESB.
1. Cloud does not have sephiroth's DNA. He like all the others in SOLDIER have Jenova cells making them physically stronger and faster.
2. The Sephiroth clone only exists in the first two discs, once you reach the true Sephiroth who's been trapped in a giant materia crystal for the last five years he takes over.
3. Sephiroth never fought Cloud at his full power. He took on AVALANCHE while holding back Holy, the planets ultimate weapon, he still owned them until Aerith's prayer came into effect.
4. Sephiroth had been killed to times before Cloud faced him. Sephy was running on empty, by this point just about anyone could of taken him down.
5. The Ultimate weapon Cloud gets is directly powered by his health the more damage he takes the weaker the weapon becomes
6. Despite his enhancment by the Jenova cells Cloud can not compete physically with Inuyasha
7. Most of the magic Cloud uses can be dodged or blocked by Inuyasha only the later Summons and perhaps Comet and Ultima Magic can harm him
8. Omnislash is a beserk attack that involves Cloud swinging his sword wildly 25 times then doing Braver. In an actual fight this can be dodged and Inuyasha is probably fast enough to block the strikes.
9. Inuyaha can perform leathal techniques without his sword (Iron and Blood claw)
!0. Cloud is going to lose accept it and move on.
He continues manipulating Cloud until AVALANCHE reaches Sephiroth's body inside the Northern Crater, by which time Sephiroth has so whittled away at Cloud's mind that he believes he is nothing more than some of JENOVA's Cells that had assumed the form of a real person named "Cloud." He then willingly hands over the Black Materia to Sephiroth, which Sephiroth uses to call forth Meteor. Afterward, AVALANCHE and the Shin-Ra executives present are forced to flee from the collapsing area, and Sephiroth then erects a field of energy around the Crater to prevent entry. The force field protecting him is later penetrated by Shin-Ra, and Cloud and the rest of AVALANCHE then descend into the chasm and defeat a mutated Sephiroth, his body having merged with JENOVA. After destroying Sephiroth's body, his spirit makes a mental assault upon Cloud, attempting to overcome his will as easily as it had done in the past and take Cloud's body as his own. However, Cloud's mental defenses had grown and he triumphs over Sephiroth's spirit, at which time Sephiroth's Spirit Energy is reclaimed by the Lifestream.
Alright you keep saying Sephiroth is weakened but yet where did you hear that from? Every site I went to never mentioned that Sephiroth was weakened.
As far as help goes, Inuyasha also beat the bat demon alone. With a single wind scar, if I remember correctly. Reihucotze (dammit I can't spell it) was a solo act too. And he'd eat Bahamut. And yes, Inuyasha's claws are very powerful as well.
Omnislash doesn't count for movement speed, because it's basically wild flailing and not Cloud's average movement speed. And good, I was right about 26 hits.
And the various weapons in FF7 didn't impress me a great deal... Omega from FF8 was a billion times better.