we had something similar happen to our house. we had a tree fall on it and squish part of it. ins guy wanted to save the foundation and the walls, just replace the roof he says. nah, that did sit well with me. i fought him, they upped their adjustment a little. still not working with me, we bickered with them some more and it went to mediation... a third party came in and gave another opinion, we won some more. still not complete replacement costs, but they did give us more than what they wanted. i will also say it was nice tearing it down and starting over completely. i had it on the ground in 7 mins, and loaded in cans and out of there in 3 hrs (mostly waiting on truckers). it was a 20ft by 50ft single story addition off the back of our house, however you guys figure out the #of cans and time and dumping costs and whatnot (we had 3 30yd dumpsters for the house and 3 dumptruck loads for the foundation totaling $1400, the excavator was mine). also, our insco wouldn't cover any disposal or yard damage kinds of stuff... this was all my expense.
hope my situation helps you guys out some, i would sure get other opinions (especially from your buddies) to maybe sway your ins adjustor. i am a contractor myself and had gotten bids from friends... not to be fraudulant, but to keep them honest as the ins co kept wanting their own contractors to bid stuff.
keep on em, and get bids to save the wall, and compare them to bids tearing it down and starting over.
good luck to ya, keep us posted!