To be clear, most of these (Aberlour, Glenlivet, Longmorn, Laphroig, &c) are totally separate distilleries run in some cases by people who were involved in the process since before Chivas bought them out. There are also several distilleries operated by Pernod that don't sell direct to the public, but instead contribute to Chivas blends (the Craigellachie distillery grounds were literally our backyard on vacation a few weeks ago, and despite it being essentially an industrial distillery, you wouldn't really have been able to tell it apart from Benromach by the exterior).

So this is a situation not at all like the MGP product situation. Aberlour and Longmorn aren't selling the same distillate (although they probably source the same malt).