The NHL is being hit hard by covid, despite there only being 4 players unvaccinated at the beginning of the season? How good can the vaccine be?

Anonymous
I know no vaccine will stop 100% of infection, but this is a little much. The Calgary Flames organization has over 30 people in covid protocols even though they have 100% vaccination.
Updates
+1 y
We were all told these breakthrough infections were rare. I don't call over 130 vaccinated players in one league rare at all.
The NHL is being hit hard by covid, despite there only being 4 players unvaccinated at the beginning of the season? How good can the vaccine be?
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