"Key cogs" -- not sure that's a real term.
Anyway...
The keys to Dallas winning the title last year, after Dirk, were really JJ Barea (who was Dallas's main scorer when Dirk was taking it easy) and Tyson Chandler, because of his defensive presence.
Terry and Kidd were great, no doubt. But they were really just role players.
Barea was huge for Dallas on offense and Chandler was huge on defense. Both those guys are gone now.
Replace with more old guys in Odom, who looks either lost or just done, and Vince Carter, who peaked 8 years ago.