The Miami Heat's offseason moves have largely revolved around maintaining flexibility. That's why it's abundantly clear that they are unlikely to fill the final spot on their roster before the start of the season. A move that will give the team even more flexibility this season, keeping an open roster spot would fall right in line with how the Heat has operated this summer.
It may not be what fans want to hear, especially after an offseason that left a bit to be desired, but it's something the Heat have done before, and a path it wouldn't be surprising to see them take this year.