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-Is there a possibility that spectators of a sport like you and i with no professional training can develop a better understanding of a sport than some professional coaches of some teams?
This is different and it depends. If a speculator is doing some gambling and the coach or player is not a very huge difference. But for the sake of experience, we all know players/coaches known better and a lot of understanding but could be "limited", while speculators could compare different games/teams if this speculator is into game or serious to know everything.