I don't know about the ROI, cuz I feel like advertising in general is all about exaggerating impact. I've always felt like much of the impacts in various facets of this industry are greatly overstated (especially in app mobile advertising)
However, you're wilding if you don't think they'll be visible. Every slow motion replay of Curry hitting that buzzer beater will show your logo. In all the promos they'll be visible. When they show Derrick Rose slumped over clutching his knee, he'll be helped to his feet with your logo clearly in sight. Then, as many have mentioned, there's the jersey purchasers who become walking billboards for you. You'll definitely get that visibility.