I've come across a few releases that mentions "marketed and distributed by" label xyz...

I think the new relationship should be added to better reflect this.

Here's an example: http://cdn.discogs.com/OtqavGF0nh37-S_1aa-hyK8g__Y=/fit-in/600x456/filters:strip_icc():format(jpeg):mode_rgb():quality(96)/discogs-images/R-3532382-1334156856.jpeg.jpg