Gwynne is not now 'working on Starship'. The South Texas base was simply integrated into the normal organizational structure rather then being a Skunk works kind of thing. Gwynne always helped with work on Starship.

Its simple a restructuring that was always gone happen after a while and had nothing to do with 'Gwynne' taking over management from Musk or whatever spin Musk-Haters wanted to put on it.