Should a prisoner be substantively disadvantaged by having to meet a higher burden of proof on her Brady/Giglio/Napue claims because the prosecution has been successful in hiding exculpatory and material evidence until after the prisoner has had one or more federal writ applications denied on other issues in her case?

QUESTION PRESENTED Should a prisoner be substantively disadvantaged by having to meet a higher burden of proof on her Brady/Giglio/Napue claims because the prosecution has been successful in hiding exculpatory and material evidence until after the prisoner has had one or more federal writ applications denied on other issues in her case? i