These threads drive me crazy.

The argument, er discussion is flawed in that you are comparing apples to oranges.
The arguments that I see are:
Gopro asserts that ketogenic diets are not optimal for
natural body builders to get lean and maintain LBM. He cites 20 years real world experience on himself and natural trainees and gave a study to support this view.
Built and Jug assert that ketosis diets is the best way to get lean and maintain LBM. Both cite anecdotal evidence of why this is true and can produce numerous studies of the
general population as to why this works.
And both arguments are probably correct in their analysis depending on the subjects/population they are discussing.
I may be over simplifying or reading too much into this but I think that Gopro's opinion is based on individuals who train for contests who typically start at a 10-12% bf level and diet down to a 5-6% bf level.
I think that Built and Jug are talking about individuals who start out as obese and diet down to the 10% bf range.
In order for this discussion to be more meaningful I think we need to agree or even define the specifics of what we are debating here.