Rau of course, he basically engineered the whole war heating up
and as for Patrick Zala being a big villain, i myself saw him more as a puppet of Rau, ofcourse Mr. Zala thought differently (as did everyone else)

to PSJ, Djibril would've ruled if the plot device wasn't there, otherwise it wouldn't have been possible that the Destroys were taken down that easily

edit: ofcourse this is up untill now, who knows what Dullindal or Rey (or Dullindal and Rey) may pull out the old hat