Honestly, it makes no difference to the buyer and its better for the birds since they aren't being shipped through certain hubs that are known to cause issues.
McMurray (and most hatcheries) do have some breeds on hand but not all.
I think McMurray diversified recently, since bird flu took out...
Most hatcheries outsource some breeds or species, it's normal. Especially for waterfowl. I am unaware of any hatchery that has all fowl on sight.
Most things that that the uninitiated might find concerning with hatcheries are normal practice, it's just not well known.