Picture #11 is definitely Gen. Pershing with the Queen. He was the AEF commander, and everyone recognized that the entry of the US swung the balance to the allies in a big way. So I see nothing unusual about the Brits Royalty wanting to meet him on a tour of the front.
That said, these are awesome photos. You have them scanned, make them available to a number of groups on a DVD. They are too good to lose.