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Thus I've theorized that Cloud extends his own spiritual energy into the blades before releasing them into the air (this allows them to hover momentarily as he jets from one blade to the next). Since his energy is equally distributed to each blade, Cloud must utilize each weapon in his attack in order to unleash his full power. In this way, we see a contrast between the original and the V5.
Since most Limit Breaks involve spirit energy, I just assumed that was the case from the beginning. The new omnislash has fewer strikes than the original one, and it basically surrounds the target to launch attacks from all directions. Zipping around with unnatural speed would increase the damage inflicted by each blow; it'd also leave him in range of a counterattack for a shorter time.