"The Dallas Mavericks are certain Shawn Marion deserves strong consideration for the NBA's all-defense team.What they also now know is that, after Marion missed the past three games, the only logical way to replace Shawn's "D" is with a DeShawn.It's no coincidence that the first syllable of DeShawn Stevenson's name has come to define his work since arriving with the Mavericks. He's received the past two games to guard Portland's Brandon Roy and Sacramento's Tyreke Evans.He did a terrific job against Roy, who shot 4 of 14; and, while Evans ended up with 27 points, he also had four turnovers and took 21 shots.So is Stevenson making a case that he should be in the rotation for the playoffs, when the Mavericks will run into a lot of crafty, talented wing players?"Hopefully," Stevenson said. "I know we've got a tight rotation. I'm just trying to show what I can do. The coach knows. And hopefully I can get some minutes. If not, I've just got to be ready like I'm doing right now."One thing for sure is that he's gained some allies in the locker room with the way he's filled in for Marion."