It seems to me that when Brad Carton plays and builds chords he keeps all the previous notes and adds what ever note he's building on next. For instance if he plays a C 13, then he plays C,E,G,Bb,D,A, he's keeping the 9th note, the D, when he adds the 13, the A.
But my chord dictionary and some truefire resources show me different. They show a C13 chord with the 9th note eliminated and the 13th note is simply added to the C dominate chord, so it's C,E,G,Bb,A. Howard Morgan demonstrates that if the 9 is added to the 13th chord then the chord is called C 13 add 9.
Is there some knowledgable person that can claify this for me?