So, Team ratings do inform about the decrease in performance (modulated by stamina) as well as match-ups.
NO!!!!
they are not a function of the matchup.. your teams rebounding team rating is not dependent upon your opponent, though it is modulated by stamina.
My english is suffering here... When I read that statement I understand that Team ratings as well as match-ups (by this I mean that both of them have someting in common) do inform about the decrease in performance that occurs when players get tired (This is what I was talking before). Since stamina have a direct effect on this decrease in performance(or that the decrease is a function of stamina), both of them (Team Ratings and Match-Ups Ratings) are indirectly modulated by stamina.
I think I got it right, just that somehow we understand different things from the same sentence. But it is ok, I'm not a native speaker.