"I cant figure out what could cause this damage but never leave any other evidence. The grille was fine, there is no paint or evidence of an animals remains, there was no dirt or rock particles."
Could it have been driven into a pile of snow/ditch and the resulting packed in snow didn't damage...
do your drums have a "lip" (where the pad has not worn down the drum) on the outside, or were they machined? If there is a lip on the outer side of the drum they will feel tight but are actually not ajusted as your new pads are only contacting about 5% of the drum surface (contacting the lip only).
I bought a truck with a bad brake shudder. It turned out it had a bent axle, which on my 98 2WD really threw the drum around. I could visibly see it with the rear wheels on stands.
depends if your system was set to "DEF". In my understanding, when "Defrost" setting is selected the compressor still turns on to keep things lubricated in the off season. But it sounds to me like it was concluded your tensioner went bad... a bad tensioner will throw a belt in my experience...
I think we've all been there and had that kind of day. At least you didn't walk out from lowes after forgetting your wallet and find out your vehicle was stolen...
I'd look into the flex plate first... I believe somebody said it was possible to unbolt the torque converter from the flex plate, slide the TC back to the rear of the trans (with a prybar, all you need is about 1/8 of an inch clearance) and then you should be able to start the engine and see if...
Or if you happen to have a smart phone you can set up your test plug and take a video of what you see. That seems only a little less work than riding around with a friend all the time.
I'd want to check for spark (easy enough to do on the side of the road) the next time it quits. spark/no spark is a diagnostic fork in the road, helping you eliminate a lot of unnecessary work.