Um...
The author is pretty much trashing Dalembert in that quote.
the group in their primes (ages 26 to 30) isn't much to look at -- other than Yao, Samuel Dalembert and Brendan Haywood are the best of the bunch. So at best, we probably need to wait a few years for the younger generation to hit their peaks.
He's not saying including Dalembert and Haywood in with but, but saying "other than Yao, the 2nd and 3rd best centers are Dalembert and Haywood, proof that the position's weak".
Easily misinterpreted, but if you say "other than yao, dalembert and haywood are the best" without separating Yao from Dalembert and Haywood, it doesn't make grammatical sense.  There's nobody else to be "are the best".  It's a statement showing the distance between Yao and Dalembert/Haywood, not including Dalembert/Haywood with Yao as reasoning for the position being strong.