I think showing the order for a response and reply as a show-cause order may just be the standard way the court does things. The order for a response for the petition to recuse Lester was also listed as a show-cause order.
Sadly, I agree with cboldt on the chance of success. I'd say ten percent, at very best, unless the defense comes up with some argument I haven't seen yet in the case law. The only one I can think of that might distinguish this case is that GZ is being denied the ability to confront a witness, which implicates his 6th Amendment rights. That's sketchy, though, because Crump isn't a state witness against GZ, and I'm not sure denying access to possible impeachment evidence for W8 is enough to qualify as a 6th Amendment violation.
Added: Actually, there is the argument that denying access to Crump violates GZ's right of a compulsory process to obtain witnesses in his favor.