Pushes break the monotonous flow of the accompaniment. In Biab you have some options: hold a chord, mute or a short hit.
And you can push it by 1/8th or 1/16th of a bar.

Takes some experimenting, but without it, you only have endless accompaniment. With good use of pushes and holds you can make an arrangement, a rhythmic arrangement.
I made this some time ago. Every pink chord is a push, a hold or a short hit.
If you would like to have the mgu-file, it’s on my blog.

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