The Redskins made some roster moves on Tuesday and on the defensive side of the ball they signed defensive lineman Kentwan Balmer and cornerback Domonique D.J. Johnson and waived defensive end Darrion Scott and cornerback Brandyn Thompson. Here is a look at the ramifications of the moves:--Balmer was a draft bust for the 49ers, who took him out of North Carolina in the first round in 2008. By the time they traded him to Seattle two years later, his value had deteriorated to a sixth-rounder. At 6-5, 298 he is the perfect size for a 3-4 defensive end and he just turned 25. Balmer has some physical skills but his attitude has been questioned. He went AWOL from the 49ers camp, upset over his lack of playing time and that was the last straw prompting his trade. But this is a low-risk move for the Redskins. They will have eight games to see if another change of scenery will turn Balmer into a useful player. If he cant they havent lost much of anything.--It will not take much for Balmer to be at least a modest upgrade over Scott. It is unlikely that he was even in the teams plans for this year until a knee injury sidelined Jarvis Jenkins for a year, forcing the team to keep Scott for depth. He has played in just six NFL games since the 2006 season.--Johnson was talked about as a mid-round prospect coming out of Jackson State in 2009 but he ended up going undrafted. He signed with the Giants and played in 10 games for them in 2009-2010. The Bucs picked him up when he was released last year and he was with the Vikings earlier this year. He has good size at 6-2 and decent speed and athletic ability. It is likely that he will be evaluated mostly in practice. Barring injury, it is hard to see him getting much playing time in the regular cornerback rotation.--Thompson has now been released three times in the last five weeks. The seventh-round draft pick as been put on the practice squad following the other two moves and there are reports that he will return there if he clears waivers. It seems apparent that the Redskins like his potential but believe that he needs more development.Analysis of offensive roster moves here.