In my view they are now even. Meaning that most teams that think they're a center away would think that adding them would put them into contention.
If it was Duncan in Minnesota last year, he'd be in Boston now, but why should TD leave the Spurs? Shaq might be a little old, but he'll prove that to us all this season one way or the other.
Before the Spurs won all those titles, Shaq was the man, but Duncan has won enough titles without Robinson to be on the same level with Shaq.
The Spurs and Celtics are the only teams not worried about trying to get Shaq. And they are both worried about having to face him in the finals.