The issue I always had, and I know a lot of Sacramento fans felt the same way because I lived there for several years during the Webber years, was this: even on those great teams Webber was never really "the man."
On those great teams Vlade made the offense go, running things out of the low post. If the Kings needed a big hoop, you wanted Bibby to take the shot.
Webber was one of those guys who you never really trusted to produce, or even make the right decision, late in games. Nor did he dominate big playoff games the way the greats do. His numbers would end up being good, but in a surprising way - "Webb had 24/12? Really?"
This is important to me, because a lot of the Sheed/Webber debate above discusses team success. I generally think team success is overrated by some people, but in this case it's important because if Webber had come up bigger, he would have a ring - so in his case, individual success and team success are actually pretty close to the same thing.
That pushes against his case in my opinion.