What do you think about this plumbing? Cast Iron video

[Alesha Walker]

I have a historic home I am working on a deal. We had camera put in, and plumber could see portions of cast iron and said we should replace everything. He could not get into copper lines due to smaller fittings, but said if cast iron was bad likely copper bad too.

Here are his videos:

video 1

video 2

Wholesaler got a plumber that says he is able to get into copper portion and looks fine and he believes we only need to replace a portion at substantially less. He sent this photo and said due to the color difference the copper looked to be fine. 

photo

What are yall seeing if anything?

[Henry T.]

Not enough info here. the scope only went out 18'. Is that all of the problem or does it go another 100 feet? Get a bunch of bids and make a decision if its worth it.

The line looks dry, why is that? Is it uninhabitable?