(515) Why most renowned contempory writers didn't start in Shakespeare's first 3 decades of life (1563-1593) their own literary career but only after Marlowes death?

Why William Shakspeare, George Chapman, Michael Drayton, Thomas Heywood, Gervase Markham, Richard Barnfield and the "strange double" of  John Davies  started their literary career only 

after Londons greatest poet Genius and dramatist Marlowe had unexpectedly disappeared in 1593?

                                       Do You  have any plausible explanation?

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Be aware that you cannot  expect a reasonable answer
 from the "Stratfordian" Shakespeare Academe.