Athletes like LeBron are unicorns. Any elite pro athlete is a unicorn.
In order to create offspring that can also become elite players, you have to marry and procreate with an athletic woman.
Steph Curry is a good example. Dell Curry was a solid NBA player. Sonya was a college volleyball player. Neither Steph nor Seth are freak athletes but they made the league on their own merit because Dell married an athletic woman whose genes complimented his own.
Look at Swagu's kids. Marcus married a WNBA sista and now his son is a top hoops recruit and his daughter is volleyball player at one of the top programs (U of Texas).
Klay Thompson? Dad was a good player in the league and Mychal married a white woman that happened to be a college volleyball player that also ran track in high school.
Bron married a good, solid woman for building with, but he didn't max out the athletic genes for his boys. Jordan did the same thing. Juanita was a lawyer, not an athlete and his sons ended up being guys that couldn't make it in sports.
TL;DR - In about 25-ish years we gonna hear about Bam Adebayo and A'Ja Wilson's sons wrecking AAU tournaments nationwide.