The Miami Heat along with the rest of the teams involved just finished summer league play. The NBA Summer League is often a place that rookies, second and third-year guys, and journeymen go to show their stuff. This is usually for one of a few reasons.
They want to show that they belong in this league as rookies, show that they have taken a step as second or third-year guys, or land a spot or training camp invite as journeymen. The Miami Heat definitely had players to check two of those three boxes during this past Summer League session.