Why can't I drop certain players?
UNDROPPABLE PLAYER LIST
All Standard and ESPN Custom leagues will observe ESPN's Undroppable Players list. The Undroppable Players list is comprised of select elite level players who cannot be dropped to waivers at any time during the basketball season.

In ESPN "League Manager" Leagues, the undroppable list is comprised of players who cannot be dropped to waivers at any time during the season. ESPN introduced this feature to prevent collusion (In these cases, owners would be able to drop star players, allowing those first on the waiver wire to pick them up). League Managers can choose if they want to allow owners to be capable of dropping all players or be prevented from dropping designated players. This setting can be changed by the League Manager at any time during the season.