This right here. The clutch is damaged not burnt and the wear on one side and not the other is also a telltale sign that something was mechanically wrong. Hammer them on these points as they are inconsistent with their conclusion.
I also had the procal tune installed last week on my 7MT non-sas running P285/70R17. IMO it makes a huge difference in overall drive-ability. It makes usable power below 2k rpm. Totally changed my cruising/shift points.
WOT the 2.3 is now a pissed off little beast. The procal monitor shows...