A positive test can come anytime from 2 days after exposure to almost 14 days. It is probably the case that Trevor testing positive on Wednesday could be followed by teammates being tested positive on Friday or Sunday.Well remember, these are college students and he has a girlfriend. It is unfair and an impossible ask for him to never be in any social settings. It is infinitely more likely that is where he got it than from a teammate. Besides, over half of the Clemson football team has had Covid (a third had it by mid-June), so they almost have a quasi-herd immunity amongst themselves.