so your saying yamato accept nero as its maste because of his connection to vergil and that because rebellion isnt as demonic as the other things he absorbs and because its dantes weapon and personally keyed to him nero couldnt absorb it. but wasnt yamato keyed to vergil in that same manner?
We're talking about absorbing matter not using it for if it worked like that Nero wouldn't have been able to pick up Rebellion to begin with. Anyone with enough strength or demonic energy can use Rebellion but there are other uses or bonds that must be achieved to use Rebellion's full power such as Devil Trigger. I doubt Dante can devil trigger with Vergil's Yamato (considering he wielded it in DMC4) or that Vergil can devil trigger with Rebellion (same goes for Nero).