A liability? Did you notice Pop panicking every time Diaw posted up and threw in those baby hooks against Fin? Absolutely not... the idea was to *let* the Suns funnel their offense into Diaw. It was this -- plus the Hack-a-Shaq -- that got the ball out of Nash's hands, making the Nash/Stoudemire two-man game disappear for entire quarters at a time. The Suns themselves admit (with the wisdom of hindsight) that the strategy worked like a charm.
I know you've been watching the Spurs for years, man, but you should be used to Pop's subtle manipulation of opponents' team dynamics. Personally, I thought it was a thing of beauty in that last round. Now let's see what he cooks up for the talent laden Hornets...