I love the trade from Boston's point of view, but don't see it from Memphis' point of view.
They give up a guy with potential for salary match filler (Scal) and three projects. BBD would probably see some playing time for Memphis, but Giddens and Pruitt will be way back in the depth chart. Pruitt in particular doesn't make much sense. Memphis already has: Conley, Crittendon, Lowry and Mayo.... no room for Pruitt.
So, the deal would need to be sweetened for Memphis to bite: swapping Powe for BBD might do the trick, but as a Boston fan I would hate to see Powe and his hustle be replaced with Darko and his moody underachieving.
For that matter, if we want a moody underachiever, we could just sign David Harrison.