http://www.post-gazette.com/sports/...rs-defensive-coordinator/stories/201501100138
Here is a link with more on the change. The quote LTL mentions certainly makes it clear how LeBeau feels about the whole thing.
amreader, there was some talk, but it seemed to fade with the four-game winning streak at the end of the regular season. The defense got better later in the season, but it was awful in the loss to the Ravens. It's hard to put that on LeBeau given the ****-poor job Colbert and Tomlin have done in building that defense. Letting Keenan Lewis get away was a huge mistake and giving similar money to Cortez Allen was even worse. Injury excuse or not, their top free agent acquisition this past offeseason, Mike Mitchell, failed miserably. They did nothing in free agency or the draft to address their problems at cornerback. Jarvis Jones is looking like a bust at outside linebacker. Ryan Shazier is fast, but he's way too easy to push around for an inside linebacker.
I wonder if this move is partly about philosophy. Tomlin ran a 4-3 scheme in Minnesota, but he adapted to LeBeau and the personnel when he arrived in Pittsburgh. The result was one Super Bowl victory and another appearance, but things have changed. The players got old and more and more teams seem able to adapt to LeBeau's approach. The Steelers don't have the players to make it work, especially at outside linebacker, so perhaps Tomlin and Colbert saw this as the time to overhaul everything.
I wouldn't be surprised at all to see the Steelers switch to the 4-3 in the next year or two, which is probably a better fit for some of their personne. Lawrence Timmons will do just fine in any system. He and Cameron Heyward are the only real standouts on defense and Heyward seems better suited to a 4-3 system that would allow him to be more of a playmaker than a guy taking up blockers.
If that is the purpose, I don't mind this move, but I would have rather seen LeBeau leave on better terms.