I don't mind if Fields starts, nor Shump. JR Smith should not start we need him in the second unit to provide scoring. Baron and Smith have a nice rappor going already too.
The way I see it, it's quite nice as Shump and Fields are both still young, game to game you can play one or the other more depending how they each perform out of the gate. Fields was having a bit of an off night so Shump picked up the most of the minutes second half and provided great cover. I'm sure the opposite will happen at some point since Shumpert will not play great every single game, he's too young and his consistency isn't there yet.