I would definitely stick with +1. Even if you assume all of his FTs were on 2s, and give a very liberal proportion of them to +1s, he was more efficient shooting from 3. And I would definitely expect that to be the case again. Granted, he can score inside, but really even at high D1 most post players can score inside a little bit, enough so that if you want to badly enough you can let your shooters shoot and maintain a reasonably balanced offense. Your other 2 quality guards are nowhere near the shooters Darby is. And at the end of the day, when a guy has 87 speed, 99 PER, 99 BH, you could pretty much give him any other set of ratings you wanted and it would be hard for him to match his perimeter efficiency on 2-pt shots.