According to the spoiler "Black whip" is stronger than it was originally because of OFA.
MHA 213: The Soul's whereabouts
The guy from last time keeps telling Deku to do his best very loudly, but Deku can't respond since he doesn't have a mouth. Though he starts to realize that he isn't dreaming and this is truly inside the power of One for all. The guy then reveals that right now Deku is utilizing his quirk --the uncontrollable power that he is emitting in the outside world.
All of the inheritors of One for all have had their individual quirks mixed into it. It's like a small point hidden underneath a massive flame. Right now that core while tiny is puffing outward at times even spilling outside of gaps and manifesting itself as it is now. In short the tiny core that is One for all is growing. Deku wonders why this is happening and the guy explains that Deku thought earlier that he'd capture or seize something right?
That's where the guy's quirk comes in --Kuromuchi or Black whip. However it's a quirk that OFA added, and thus is much stronger than it was than when he was using it. He then explains that his power does respond to his feelings and if he has anger as the base of his actions then it's likely his power will be harder to control. It's thanks to the 8 people who passed down One for All that the power has become unbelivable, and he warns Deku that he's still got 6 more quirks that will manifest.
He then tells Deku to control his feelings and control the power, and wishes him good luck as he'll be the one to successfully master One For All. Deku returns to his senses, where Monoma immediately attacks him. Everyone has gathered in one place turning this into a brawl. Deku's mind is whirling with what he just learned but he realizes One for all hasn't hurt anyone.
All Might asks what they should do, and Eraserhead says to take a good look --the fifth set is still continuing as Shinsou and Deku confront each other.