Ok, Norm, I'll defer to your more experienced knowledge with regard to what is and isn't possible vis a vis the image we see here. Given that, I'll admit to being stumped.
I still think that it's a Least Sandpiper though... :-)
Maybe Hummer or Eric CAN will weigh in with their two cents, at least I hope so. Or... with bobbyz's permission I'll post this on birdforum.net and ask for an id on it.