I called a company that an insurance had referred to do the drying .  

Major dry rot/pest issues or perhaps knob and tube wiring would make me hesitant as well. 

I’d rather trust a professional with a moisture meter to see if it’s dry (just after or even during a heavy rain would make me feel better) before fixing the ceiling.

Additionally, you should probably instruct the PM to dry out the attic if you have with fans and / or a dehumidifier. 

I’m hesitant because of mold, dry rot, etc. what should my frame of thought be on moving on these.

We put a lot of efford and attention into keeping basements dry, but we still have an occasional pipe burst or sump pump fail and see issues and when you get water in a basement; carpet can be dried and cleaned, it's the open cell pad that is holding on to gallons of water like a kitchen sponge.

Is there a world where it makes sense to leave parts of the dry wall up and try to just clean them?

So today ozone treatment and air return box repair, then I found some dry but soft base board behind the refrigerator

I paid the County for a special search that also came up dry.

Better yet is to buy well so you can pull as much of your own money out as soon as possible to replenish your reserves and have dry powder to put to work for the next deal.