The initial poems of dedication of Thomas Storer and John Raulinson to William Vaughan clearly reveal that they are not adressed to a singular person but two different personal entities-.(see Faksimile excerpts)
In Thomas Storer's poem he cleary differentiates between the one (Thou / thee/ thy -"-amongst the learned"-"worke shall live" , paine...,muse) and the other (he, his..his name , his fame....)
John Raulinsons Poem also differentiates between Thou (thine, thy...art, - hast effected ...make men ...,hast made manners, thy pen ) and He (his - not his art, he never began, his rich touch )
There are significant arguments that William Vaughan (similar to Shake-speare) belonged to the multiplicity of pseudonyms of the poet-genius Marlowe!
( As implausible and absurd as it may sound without a background knowledge !)