I'd discount the dead rodents, because a lot of places can have dead rodent carcasses.

The dead croc.. I'd disallow ONLY if he was de-fleshing it to use as a skeleton, which frankly is a stretch looking at the picture, it doesn't look as if it's set up for de-fleshing, it just looks like a dead croc that was left to rot.

The dead snake is a dead snake in a filthy enclosure. Sorry, no way to stretch that to be understandable.

The more proof that comes out, the less defensible the position looks. Hopefully the situation gets resolved and the full truth comes out. I'd expect to see a lot more pics of the situation, since it was described as dire for all the animals. There should have been pictures of everything on the site.