Yes, but he is the leader of the warrior orderhall, and who else are they going to put there instead? Hymdall? Odyn is a lot more recognizable, iconic and is the actual orderhall leader.
Which leaves me to wonder why they put Kor'vas as the DH representation. yes, I know, DH choose either Altruis or Kayn in their startign zone, but it's canon that Kayn is the one that stuck with the Illidari.