Don't waste your breath explaining this. A lot of people who post here and on other forums seem to think that Apple is still two men and a dog in a garage bashing out tin themselves. They clearly aren't but they don't seem to think that a company the size of Apple could design two widgets at the same time.And Mac Pro's are affiliated with Apple receiving Permits to Test self driving cars? You do know Apple has more than one Department that works on various projects within the Company?
Anyone who has worked for a large multi-national computer company (I did for 20 years) would know that many system design projects are being worked upon all over the world at the same time.