The thing about Diaw is he's captured lightning in a bottle in Phoenix. There's no other team -- no place within the contiguous U.S. or Canada -- where he could succeed at this level like he has in Phoenix.
He gets to play intermediary/conductor here; when Nash doesn't have the option to pass angles on any given drive, he can set up Diaw for a different POV. Marion owes as much to Diaw as Nash for the season he's having. On the other hand, Diaw would play center for no other team, and he's just not a regular scoring threat on his own to log regular PG minutes. It's a shame. If he were a hair more aggressive, he could play Joe Johnson's role from last year, and *that* would make him a real threat to leave.
His work here should be hailed, but it should also be put into perspective. He's valuable to us, but not nearly as valuable to other teams.