MIAMI – While the phones remain manned around the clock by the Miami Heat amid NBA free agency, on the other side of the country it is about sweating the small stuff. Because for all the Heat do or do not come away with on the NBA’s high-end personnel market, the need for complementary pieces may never be higher amid the team’s tight position against the luxury tax. To that end, assistant coach Caron Butler, who is guiding the Heat’s summer roster, appreciates the task at hand starting Monday at the California Classic in Sacramento and then continuing afterward at the larger NBA Las Vegas Summer League. “This,” Butler said, “is about the growth of our players.” And, with that, Butler rattled off the names of 2023 first-round pick Jaime Jaquez Jr., 2022 first-round pick Nikola Jovic, center Orlando Robinson and two-way contract contenders Jamaree Bouyea and Jamal Cain. “It’s about looking at those guys, seeing them get better, from a student-of-the-game standpoint, or a playing-the-game standpoint, to make reads in the pocket, defensively, embodying the culture,” Butler said, with the Heat completing a two-day summer camp Sunday in Sacramento.