In addition to Marc Marquez's first laps on a Ducati and Pedro Acosta's debut in the premier class, the post-race MotoGP test at Valencia was the stage for the first public appearance of Aprilia’s latest technical innovation on its RS-GP bike: a full carbon fibre frame being used by test rider Lorenzo Savadori.But while Aprilia is now content to show it off in public, it insists that the new frame remains at least for now a pure research tool rather than something that will be ready to race any time soon.It's not the first time in 2023 that we’ve seen…