There is no such thing as a natural fighter Apart from genetic traits that are inducive of the making of a good fighter (Chin, Power, Bone structure, skin type, nose structure, Hand structure) The only exception is if you're a descendant of Hercules himself and have Gypsy Kings on both sides of your families. Fighting royalty blood.
Yeah, it's not a coincidence he suffered three serious injuries in the last 2.5 years, same goes for his fellow amateur great Korobov who had over 300 fights and suffered serious injuries in back to back fights in round 2 and 4 respectively. Likewise, fellow amateur greats Usyk and Beterbiev who also had very extensive amateur careers (over 300 fights) and are all in their thirties have suffered multiple injuries in the recent years too.