Whilst continued and deeper research is needed, let me turn it around. Why are you equating the deaths to the vaccine? Why not un diagnosed Covid which we know for a fact causes lung issues and which we also know, is often asymptomatic in the young.
Its dangerous to create correlation with so little information. I did check down some of the list of names and the only thing that immediately sprang out were their young ages.
Kalen Leavy had a known medical condition that his parents did not want disclosed according to Coroners report, no mention of whether he was jabbed or not.
However, as endocarditis, myocarditis, or pericarditis are rare but documented possible side effects, surely the first thing, especially in the very active would be to recommend abstinence from vigorous exercise for a few days although some exercise is good to reduce inflammation.
Who know! Common sense and monitoring is the key I think.