Is Sara in Idaho ABR? I have a friend in Pennsylvania with ABR, I was going to ask her if she had any NW contacts, but I'm thinking that it sounds like you've already contacted their NW person.
And Martha is Operation K9?
Two things you might try if you haven't already: Post to Molosser Talk, which can be found at http://www.moloss.com
. Lots of AB folks post there.
A lot of folks on the board are breeders, but you occasionally will stumble across people able to offer advice/suggestions/help in rescue topics.
Also, try posting to http://members4.boardhost.com/NABRA/
I cannot vouch for the folks who turn up at these sites to help with dogs since it's a public board, but they both attract AB folks, so it might get him some exposure.
Please keep me posted on his progress--I love ABs. I wish I could do more to help. And please, please make sure if you turn him over to another rescue that you check and double-check that rescue for references and home visits, etc. We get the same kind of scumbags in AB rescue as pit bull rescue . . . I'm sure you know this already, but these days I feel like you can never be too careful.