If Vlade had been brought here merely because of his defensive skills, I might agree with you. He wasn't, though. He was brought here because Petrie was well aware that bringing Vlade Divac into the mix would bring wisdom, humor, maturity, guidance and a whole lot more.
If Vlade wasn't much more than mere statistics - impressive as those stats are - I seriously doubt if Petrie would have made him the glue around which THE TEAM would be built.
Haywood wouldn't make us that much better and I don't see him as a mentor, another role Divac was able to fill admirably. I'd rather set my sights a little higher...