The thing about Bronny James that has been overlooked is, he was enrolled at USC on scholarship to play basketball, the team was practicing for a trip they were going to take over to Europe to play some exhibition games, something that college teams do from time to time.
I am pretty sure, before he was allowed to participate in team activities like practicing at USC, he had to undergo a physical, at the college and professional level a specialist usually conducts the physicals.
If he had a preexisting heart defect it likely would have shown up on his physical, evidently no defect was found, to me that rules out any sort of preexisting condition.
I think that even more strongly points to myocarditis brought on by the vaccine.
I wouldn’t argue with that, just allowing time for answers.
I would think a stress test with EKG for athletes.
I played CYO ball, so no tests for me. :)
I played High School and College ball in the 70s, I never went through a year when I did not have a mandated medical exam.
I would guess things are more strict now.