Coach Del Rio has shown that he lacks the ability to lead a football team. We already discussed the Leftwich/Garrard fiasco, but there has been other examples of Del Rio poorly handling his team.
Marcus Stroud was an incredible defensive tackle for the Jacksonville Jaguars. He was paired with John Henderson, and the two were known as the best defensive tackle tandem in the NFL.
During the 2007 season, Stroud was suspended for violating the NFL's policy on anabolic steroids and related substances. He had missed all of the preseason and five games during the 2006 season due to groin an ankle injuries.
Stroud explained that he mistakenly took over-the-counter supplements without checking with the trainer.
Fearing that Stroud was beginning to break-down and then breaking the rules, Del Rio decided to trade Stroud to the Buffalo Bills. Stroud went on to be a viable presence for the Bills whereas the Jaguars struggled to find someone to replace him. It also took a toll on Henderson now that offenses could double-team him without fear of his counterpart.
In the middle of the 2008 season, Del Rio sent then middle linebacker Mike Peterson home after speaking out during a team meeting. Prior to the start of said meeting, Del Rio reportedly didn't want to hear any excuses from anyone. However, when Del Rio criticized Peterson for celebrating a sack during a game against Cincinnati, he explained that he was trying to give the team a spark since they were down 21-3.
Del Rio immediately kicked Peterson out of the meeting and sent him home for the day. When he returned the next day, he was sent home again.
Peterson was known for being an emotional leader on the defense, and at the time was a team captain. Clearly that did not matter to Del Rio—Peterson spoke when he was told not to, and just as Peterson "flexed his muscles in celebration during the Cincinnati game, Del Rio did the same when he chose to kick Peterson out of practice.
Peterson sat out for six straight games before starting in the last two games. He was not resigned, and later joined former defensive coordinator and present head coach Mike Smith in Atlanta. Peterson moved to outside linebacker, and has done well for the Falcons.
Those two examples alone have taught his players to toe the line or else. That is no way to lead a team. There are two ways to get things done: command or motivate.
It's apparent that Del Rio cannot motivate or inspire his team. He stands on the sidelines emotionless, and his post-game interviews are dry and lifeless. How can young men get fired up when their coach is boring and lackluster?