A distiller has more control over its supply, but they run into shortages just the same. When BT ran out of stock for Old Charter 10 year old, they stopped selling it. If KBD runs out of the stock they were buying for Rowans Creek, I think they should stop selling it (or change the name to Rowens Creek and hope nobody notices).
My main point is that distillers are doing the exact same thing as NDPs, and having the name of the distillery on the bottle doesn't change the end result. I don't see the loss of age statement and drop in quality for OWA any differently than for Rowans Creek.