What changed
Dusty May is not describing one switching rule for every Mavericks lineup. According to Grant Afseth’s September 29 Dallas Sports Journal report from training camp, May said the approach would depend on both Dallas’ personnel and the opponent.
Discussing the subject after Monday’s practice, May pointed to different switching combinations used in previous seasons. His comments emphasized the need for more than one defensive look, rather than a single coverage applied in every situation.
For fans watching camp and preseason, the useful question is who is being asked to change assignments when a screen arrives. That is different from how well an individual defender works over or under the screen to stay with his original assignment.
The reporting does not establish a final rotation or a possession-by-possession plan. It does give us a clear coaching priority to follow: adjusting the coverage to the players on the floor. The linked player profiles provide historical season context as we wait to see those choices in games.