There have been signs of this coming for quite a long time now, it wasn't something that just cropped up just this last season.
Baldwin intervening, & putting his hand up to Tom Cable when Wilson was on the side-lines coaching up some suggestions to the O-Line on what he needed from them.
Obviously Pete understood that Wilson was frustrated with the lack of even a mediocre attempt at Pass Blocking by his Offensive Linemen, it's not like Pete completely ignored Wilson for his gripes, and in fact, it wasn't long after that, Cable & Bevell were both canned.
Enter Solari & Schottenheimer, the fundamentals of the O-Line start getting tweaked by Solari, but let's be honest, He is still working with some of Cable's shape shifters, or should I say Position Shifters.
Now, as an Offensive coordinator Schottenheimer's job is to try & fit all the misshapen pieces together, and formulate a plan that would please both Wilson & Carroll, now, I believe Carroll & Schotts had a falling out, and probably had a mutual agreement to part ways, it probably was the last straw for Wilson to hear that his input wasn't needed in finding a THIRD OC, so he decided that he could no longer just continue standing to the side while nothing was going to be done to upgrade the Offensive Line.
IF Wilson was going to voice his frustrations, he knew that he wasn't going to come through it unscathed, thus, he knew that his being shopped out to another team was a possibility, so why not have some say in where you might wind up playing.
Pet's several attempts to find a better fit at both Offensive Coach & Coordinator shows that he wasn't ignoring Wilson's needs, but lets face it, Pete is too Old School to completely abandon his once tried & true ideology.
Wilson is from a whole different Offensive philosophy.
Pete did agree to "Let Russ Cook" until the smoke arose, and passes started getting intercepted, so he reverted back to his old school ways.
This whole brew-haha doesn't expose a "bad guy", it just exposes a clash in philosophies.