Unless I'm badly mistaken, all 4 EDPs will supply hyd power while windmilling.
How the ADPs are controlled is merely of academic interest if all 4 engs have flamed out, there's no air or a/c power to run them anyhow.
As I understand it, with all 4 engs flamed out, all you have is batt power for lhs flt inst and radio, fire ext, igniters and windmill power for hydraulics.