Isn't in the same galaxy? You act like Dwight Howard is Shaq circa 2000. As awesome as Howard is defensively, he's still limited offensively. Tim Duncan in his prime was better than Howard in his prime. While he wasn't as dominant of a defender as Howard is now, Duncan was still an elite defender in his prime (8-time All-Defensive first team, 5-time All-Defensive second team), and he was far superior to Howard offensively. Howard is an athletic monster, but he is so far Duncan and the other great big men of all-time in terms of skill.
Duncan right now isn't as good as Howard, but the gap isn't as enormous as you make it seem. Duncan has made All-Defensive first or second team each of the last three seasons and had a higher PER than Howard in two of the last three seasons (including this season). The reason I mentioned Duncan was because you said, "The only centers close to Howard play in LA." I can't believe you actually think Andrew Bynum is better than Tim Duncan right now.