he did. Continually. He showed up to camp determined to be above the highest authority figures which is something he always does.
Your comment was why didnt he attack sporano, and umm that is pretty easy, that would have made no sense and been completely misguided.
Parcells was indifferent to the guy and that is why owens never said anything publically about him.
Todd Haley was in charge of keeping the space cadet in the shuttle and not out on the moon for a walk by himself that year.
That is why owens had continual problems in 06, because the guy he was directly responsible to and had direct control over his output, Todd Haley, didnt give an inch. He even let everyone know that owens slept in meetings all the time and was constantly late to practice.
Remember jerry's rant in the parking lot to the media about how he would fire the guy who told the media about owens shortcomings!!!! Remember what jerry called him....A RAT? Sound familiar? Only difference was in 06 everyone knew who told the media, jerry was putting on a show to keep his prized possesion happy. the other players all liked haley so there was no way owens was going to turn the locker room on haley even though he tried.
So yes he did complain all the time in 06. And yes your question of why didnt he challenge sporano is completely clueless.