Oh.....my....god.
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I am so upset right now. I am going to have to take all of the OSB and insulation out to be safe. That is not water damage, it's rodent mess. And there was basically a solid wall of it across the gap before the insulation collapsed. Tons, and tons of rodent mess. OSB is cheap so it's not so much the expense as the time, effort, and biohazard setback that gets me with this. The smell that wafted out of some of those areas was hideous once the panels were off. I don't know why neither my husband nor I could smell it until the panels were off.
The singular good thing I have learned in this is that there are very likely no living rodents left. How do I know that? Snakes. Snakes all mixed into one area of the rodent mess. Lots of snakes. Non-venomous fortunately.