The most used Green-Durant-Ibaka lineup sucked last season and at minimum the sum of all of them was not strong.
Durant-Ibaka-Collison isn’t small but it really worked at the rate of about +15 per 48 minutes in almost 400 minutes of use. Enough for me to believe that it really is a good lineup. May or may not be “great” but it is likely to be at least good.