Yes, if you will be adding automatically generated tracks, then the ACW will help with the tempo as well as establishing the chord progression for the RTracks to follow. Not sure how you would automatically generate midi tracks in RB, that may have to be done in BIB first, such as soloist or melodist, but using BIB backing tracks to follow the chord structure generated by ACW could result in a whole new feel for the song, as well as difficulties with the vocals or melody instruments.