Matt turned me on to the idea that Biab does play elaborate chords in Brazilian jazz. Lo and behold, styles like Janeiro do! Or at least, the piano does. Guitar and bass are only limited to bread and butter chords. There are clashes to be heard.

Investigating further has taught me this:
Midi only, spoken here!
1. Older styles: all instruments know only a limited number of bread and butter chords, no mMaj7, no b9, b13
2. Newer styles (Janeiro...): piano plays all the chords right. All other instruments play only limited number of chords right...
3. Self-made styles from midi are like Older styles: all the wrong notes in elaborate chords
Conclusion
*only the piano can -in some cases- play all the chords.
*there is an algorithm somewhere in Band in a Box that knows all the chords...
*...but it is only used for piano for some styles starting 2011 or so.

Now... if there is an algorithm that works, how can it be applied to bass, guitar and other instruments?

Biab, Kontakt, Sampletank and lots of nice libraries, from Fluffy audio to Abbey Road drums.
Check out these great contemporary Jazz Styles: www.jazzstylezz.com