Did the United States Court of Appeals for the Fifth Circuit deny Owney's right to constitutional due process by applying an erroneous standard in assessing materiality of a cooperating witness's late-disclosed Brady letter stating the entire case was made up of lies?

Alternatively, does the Brady decision forego the material analysis that the suppressed evidence would have resulted in a different verdict at trial had the evidence been timely disclosed?

Did the United States Court of Appeals for the Fifth Circuit deny Owney's right to constitutional due process by applying an erroneous standard in assessing materiality of a cooperating witness's late-disclosed Brady letter stating the entire case was made up of lies?