Quite frankly, even if he didn't shoot Fields would be a major asset because of his ability to guard elite shooters. In another thread someone had a video of Landry guarding Kobe. He stuck with him for 4 or 5 Kobe jinks and still contested the shot. There is no one else on the Raptors who can do that. Fields doesn't need to shoot if he lowers the score of the best shooter on the other team by 10 points, or changes there shooting % from 48 to 32.