Why is Marlowe no longer among the list of possible collaborators with Shakespeare?

From Brian Vickers "Shakespeare:Co-Author" 2002

“The second approach to authorship studies that I wish to discuss derives, like the first, from the familiar experience of reading or seeing a play and being reminded of some other’s work.” p. 57

Space is too limited here to detail all of the instances where passages in Shakespeare have reminded readers of Marlowe's work. In the 19th century many scholars openly considered the possibility that some portion of Shakespeare's early plays were written by other writers, with Marlowe the name most mentioned. That era ended with an absolute prohibition against "disintegrators" challenging the purity of the First Folio.

The prohibition has now vanished, led by Vickers, and seconded by Wells and Shapiro, with most scholars now acknowledging that large chunks of the Shakespeare Canon were written by collaborators. What is different about the modern discussion of collaborative influence in Shakespeare is that Marlowe's name is absent from the list.

This is telling. No other writer comes to mind more than Marlowe when reading Shakespeare. Yet every line, every passage, every scene in Shakespeare which vividly recalls Marlowe has been dismissed by scholarship as conscious or unconscious plagiarism on Shakespeare's part.

Cheers,

Daryl Pinksen