Stevens is a great NBA coach. He has proven that in two+ seasons.
Nonetheless, I think he does play some occasional politics with his players. It seems that because of his personal relationship with Zeller, Stevens feels it is easier to take him for granted. It could be the equivalent of how Doc seemed to be harder on Big Baby than other players. Brad values a team with all guys rooting for one another. I don't think Brad likes too much player friction due to their being logjams at specific positions. Think of when we got Brandan Wright. Brad did all he could to make all five bigs part of the rotation. Thankfully Wright got traded and that issue was alleviated.
This is really Danny's fault. It wasn't a mistake to roll the dice for Lee over Wallace. The mistake is in having too many bigs who are redundant.
This will not be a problem as long as the team keeps winning games.
I could be wrong, as this is obviously speculation.
It could be that Stevens doesn't want to upset the veteran in Lee, at least not this early into the 2015-16 regular season.
I found his recent injuries to be quite questionable. That was my knee-jerk reaction. It seemed as if we were finally at the point when Lee would swap places with Tyler. I see there is a new thread wondering if he's really injured, but I haven't read it yet.
Unless a player pulls a Bogans, Stevens is not going to stab such a player in the back. That's probably a good thing.
David Lee appears to be in denial. Otherwise, I doubt he'd be getting blocked so often with a lot of turnovers. If he's injured, then maybe his ceiling is higher than cynics like myself think.
The problem could come down to it's tough to teach old dogs new tricks and especially when they don't realize their skills have receded to a point which offsets any former ability to hide flaws.