Cinesamples hired a world-class 70 piece orchestra in a gorgeous space and sampled an enormous variety of chords, in major, minor, augmented and in a variety of inversions and articulations across the spectrum. In addition, they grabbed full orchestral tutti octaves, and lush low muted warm chords.
To avoid this, you either need an intelligent scripting that splits up the notes of the chord into their respective sections (like the voice leading engine in VOXOS), or record a large variety of chordal possibilities and trigger them with single keys, thereby maintaining the natural instrument numbers and orchestral balance and panning.
Note: A full version of Kontakt 4 is required. This library is not compatible with the FREE Kontakt Player.