I don't like those Jeff Green (PF) + Jared Sullinger (C) combinations.
Those have to end right now. Ideally, one would want Jeff Green (PF) alongside Garnett (C) as much as possible when Green as at the four position. As a secondary option, Darko or Collins. As a last ditch option, in extreme circumstances where matchups requires more speed, alongside Wilcox or Bass.
But never alongside Sullinger. He is a rookie who is a major defensive liability.