We'll have to agree to disagree here. For every Chicago situation, you have examples of us losing to Dwight and just last year Nene destroyed the Bulls. I'm not worried about teams with defensive centers like Hibbert and Perkins but defending teams with Pau Gasol, Nene, Bosh and in the Finals possibly guys like Duncan and Howard. There amount of offensive centers aren't many but they get concentrated in playoff calibre teams. The other examples are very weak IMO (Duncan is a center just doesn't like be listed as one and the one reason Perkins has survived is that he does only one thing well: defend other centers!).
There is also a matter of degree here. I don't think you need to have a HOF guy at Bill Walton for us at backup. In fact if AV stays healthy, we can easily survive and my concerns would be mitigated with what we have l but unfortunately AV is not Cal Ripken here. Interestingly there was a long run in the 80's where every team that did pick up a quality backup center went on to win titles (Walton with the Celtics, Thompson with the Lakers, and then Detroit with Edwards)
I think Mozgov is ideal: right age, in his prime, reasonable contract, decent numbers. Should be able to start if AV goes down and play big minutes. I'd be willing to give up the 2018 first round for him