MIAMI – No, it has not been a summer of substance for the Miami Heat, unless you choose to consider Alec Burks and a pair of draft picks a substantive gain. But for the Heat, an argument could be made that this is the rare counter to the adage of falling behind if you’re not moving forward. In this case, opposites not only can be true, but seemingly are. With the offseason free-agency loss of Caleb Martin, the Heat roster arguably is not as strong as what Erik Spoelstra coached up at season’s end. But the Heat also seemingly can be no worse off in the Eastern Conference standings than where they finished last season. It’s actually simple math. In the wake of last season’s eighth-place finish, the only way for the Heat to go south would be for one of the seven teams at the bottom of the conference consciously making an effort to ascend. Of those bottom seven, no team appears poised — or seemingly even desirous — of making the type of climb the Orlando Magic made this past season, when they went from No.