Exactly. Duren is a better version of Dre. He's just as bad at defense and just as bad at any offense outside of put-backs and lobs. I'm thankful he doesn't miss shots intentionally to pad his stats like Drummond did and that he spends some time in the gym, but he's still pretty replaceable in this era of the NBA.
People talk about his passing, but making a good pass occasionally doesn't make you a "good passer". When you average 2 Assists and 1.9 Turnovers, you aren't a good passer.
Duren is a high level role player. But he's also a traditional Center who's a poor defender that can't space the floor. We can talk about his age and all that, but players don't suddenly become elite paint defenders. Maybe he could learn to hit the corner three one day but I'm going to need to see him take a couple a game before we start to project that.
You don't pay that archetype max money. The worst thing you can have in the NBA is a fringe All-Star making max money. It cripples you, especially with the new rules.
That said, I'm not paying Ausar max money either, because I think the max should be reserved for All NBA first team candidates. However, if you put a gun to my head and made me choose to give one or the other a max, it's Ausar and I don't even have to think hard about it.
Why? We don't have to talk about projections with Ausar's defense. He's literally the best perimeter defender in the league right now and was a top 3 finalist for DPOY. Both the numbers and the eye test will easily show you that he warps the game (on both ends) when he's on the court. It's no coincidence that this team suddenly got good when Ausar came back from his blood clot.
If we had a spacing big man and a better coach we could run Ausar in the Draymond role as the DHO hub instead of using Duren as we do now. He's a way better passer (2 to 1 Ast/TO) and putting the ball in his hands solves the spacing issues. Imagine prime Draymond with Ausar's athleticism if you want to do some projections of what he could be in years to come. That's much closer to a max player than a big man who can't defend or shoot, not matter how good he is at layups and dunks when teams don't box him out during the regular season.