Taking another look at the photo of the male flying you posted on August 10th RCF, I think between him and Lily, we had a pair that were just a year too young to nest. Annie is a cousin of sorts of Lily's (not sure if related by blood but they are of a size) and he didn't nest until his third year, Lily will be three next year and looking at your maile's plumage, he's probably the same age as Lily. The fact that they hung around so long though is a hopeful sign and maybe we will get them back on site next year with more "success".