That's the problem of some teams in sports. They are too focused on stronger players making them more strong than before, but that's contradicting a team sport goal. They need to make everyone stronger and focus more to the players who needs attention to be train more and more to be equal to those stronger players on a certain team to avoid being a weaker team just because stronger players couldn't play.
Yes it is. I think what concerns here the most is the health of both team players. When some of their players tested positive in COVID-19, that's already a sign to postpone the game to assure that COVID-19 will never spread anymore on the team, because it could be asymptomatic and being too confident that the rest of the players didn't get it could bring chaos in the end.