Thats not what FoK does so comparing it to barrage is a bad comparison.
Yes because it spreads poisons and grants combo points in order for Sub/Sin to funnel damage into a priority target.
Barrage had terrible damage and zero interaction with BM and how it does damage. BM does its damage by managing beast cleave and bleeds causing dire beast to proc and auto cast beast cleave unless you are playing DR which is all about Black arrow/Bleak Powder damage.
Its not a good comparison because youre comparing a usefull rogue ability to a terrible hunter one when they do completely different things.