The truth about Nazr is that he only averaged about 6 and 6 in last season's playoffs in about 28 minutes (I'm guessing) -- those numbers were relatively the same as Rasho's numbers during the regular season last year. But since he dunked the ball and was more active around the rim, Spurs fans glamourized it. I've heard at least three posters in the last few days says, "He outscored and outrebounded the Wallaces COMBINED in games 1 and 2 in the Finals" which is not even close.
He knew enough basics on D to get by in the postseason and Pop wasn't going to switch back to Rasho after Rasho got healthy and disrupt the rotation. But the coaching staff fully expected that this season, Nazr would IMPROVE -- particularly on defense.
He missed the whole training camp (I'm not saying that it's his fault) where they lay down the groundwork for the year. As the season began, Rasho was actually playing decent and rightfully owned the starting job.
We aren't privvy to what goes on inside of practice, but right now if Nazr has actually caught up on D and is working hard in practice - he'd be seeing more playing time.
Rasho sucks against particular teams and I certainly would think that in a game like last night Nazr would have seen some time. I don't think there's a huge conspiracy of holding his value down or not liking him personally. I just think that he likely hasn't earned playing time in practice and he misses far too many rotations when he actually does get playing time.
That all being said, there are times when you need to scrap all the rules for playing time and just let a guy get a stretch on the floor and see how it goes. The Spurs didn't do that with Nazr. But last night was likely a big wakeup call. It will be interesting to see how the player rotations get rattled because of it.