Sorry, missed your post here for some reason. But Weber was the one who worked out the Concordiat fleet being not heavy on Hellbores, but that they had Lightspeed missiles ala Honorverse or Andromeda.
Weber started on BOLO when he designed the Concordiat Naval fleet. He would later refine his ideas and go on to create Honor Harrington. We all know how that turned out.
Yes. Donnager and her support ships would have absolutely curbstomped them into the ground. She damn near did it herself had Yao not gotten full of herself and actually put in effort into the fight.