There is some interesting stuff in that case study, but there is nothing we can generalize from it. That's the point.
There are no full scale fecal transplant studies looking into obesity to my knowledge.
> Source? Let's not criticize others for their sources and then make unsupported drive-by claims.
You're right, but upon digging deeper into the study it's even worse: neither her, nor the person she took the fecal sample from, were obese at the time of transplant. Both became obese after the treatment. The source of the transplant was her daughter, so I can imagine a lot of environmental factors effecting both of them. It's hard to imagine the donor becoming obese because of the transplant...
The point here is there are a TON of other obvious variables to examine, and gut flora may really play a role, but there is really not substantial evidence to think that's true.
Regardless of if it is true, it doesn't change much for outcomes: you still have to eat less, you still have to workout more.