Personally I don't attach a great deal of importance to kds, in sparring,but its interesting to find out who dropped who?
Vitali Klitschko was dropped by Travis Walker and Raphael Butler.
Anthony Joshua by David Price , Joey Devejko.and Daniel Dubois.
Carl Foch by Tony Bellew.
David Haye by Tony Thompson.
Sonny Liston by Ray Patterson in Sweden.
Jim Jeffries by his then employer Jim Corbett.
Marvin Hagler by Bobby Patterson.
Adrien Broner by Errol Spence Jnr.
Ray Leonard by Quincy Taylor.
Mike Tyson by Greg Page.
Teofimo Lopez by Figuroa.
Just a few examples