No chance Brian ... the shop owner isn't taking full responsibility. They've offered the home owners $2000 which is the cost of the tile and installation originally. But now look at the problems created by this mess. These people actually paid the entire bill up front ... nice family and both work, and look what they got for their money.
I think they're going to take the money ... really no other option. The complete lift of scratch and tile would be darn near $2000, let alone the re-installation.
As soon as I see something like that raw tile edge leading to the basement ... I know workmanship is most likely the cause of it all.
By the way Brian ... I found those cement board photos you sent me 2 or 3 years ago. The ones showing a side view of the cbu installation without mortar under the panels. I'm going to get those on a page this weekend.