Correct they do mainly contribute in early phases, which was the point the judge raised with the CMA and how this wasn't acceptable that them and Microsoft carved out a deal for the UK without that input, which is why he said this restructured merger would need to allocate time for third party input and that the evidence (prima facie, as it seems at first look AFAIK) of the new deal being significantly different in Mr Prevett's word, so that this would be the source by which 3rd parties could appeal the CMA's final decision, was what he said - not verbatim, obviously.