mmh i don't think that is so much contribution into it, the matchup rating give a good overview about shoot quality and you mostly have a gunner in a team who not necessarily have the best matchup rating, while the other have enough shots that the rating get some meaning but in comparision quite low.
My last games with Patient:
(36208880) - the SG is shooting like crazy, while the bigs had better chanches. But maybe to few shot that the stats is biased.
(36208822) - the PF shots like crazy, sf and C have much better chanches - and the flow was dominating.
(32832558) - again the PF, Sg and C should have much better chanches. here the amount of shot should be high enough.