A leak causing water to flow under the sub-floor and into the crawlspace can lead to significant structural issues if not addressed promptly, and you’d likely need a plumber and possibly a contractor to assess and fix the damage.

It's been restored through the magic of television :) 

It's a good idea if your location is such that you don't worry too much about damage.

This will ensure that most of what COULD go wrong gets addressed on the front end so that you don't have to get bogged down with ongoing maintenance judgement calls.If none of these suggestions seem tenable in reducing the brain damage associated with owning property, then owning rental property directly might not be for you. 

Does anyone have any experience in restoring this type of issue? 

Another could be if you have a pinhole leak in the supply line...I'd be less inclined to assume supply just because it would probably be so wet that you'd have interior damage and a much higher water bill.

Look for signs of water damage, like stains or discoloration on walls.Roof problems are also common.

Possible his drone showed the most evident damage and not so much like being on the roof.

But if you are able to risk the money without damaging yourself financially and it's truly your passion, then sure. 

., major structural termite damage, small mold issue).