Not really; more that I think that 1) it's obviously not Molly, or we'd have heard by now, and 2) Dumbledore would have been likely to arrange it that way. (It was almost certainly his idea that McG meet him outside the Dursley's in Book 1 to discuss Harry's future. Coincidence? I think not!)

By the way, this mysteriously inscribed entry (http://sola.livejournal.com/609147.html?thread=2216315#t2216315), with a photo of a page of the guest book at the Cloisters, made me think of you.