The Cleveland Cavaliers already have their maximum of 17 players (including the two-way players John Holland and Billy Preston) on the roster.
However, that doesn’t mean that the Cavaliers mean are done signing players yet. NBA teams are allowed to bring up to 20 players to training camp, meaning that the Cavaliers still have three players can extend a training camp invite to.
Furthermore, with 24-year-old point guard Isaiah Taylor on a non-guaranteed deal and nothing guaranteed for forward Sam Dekker (who has had an underwhelming career to this point), there are other reasons to extend a few invites.