I see that too, one will try to kill Merlon and the other try to kill Vail, what is interestly is that both have a lietnant to protect them, Vail have Ferdal, Merlon have Claire, and Krom, Saphira use bow, so maybe Krom will try kill Vail because Krom will want to hunt the last Ziyanor and have this your final hunt of the immortal like he said he want (I think that is true, that he want a great hunt, like we see on first mission of act 7 he bored killing another Dreadlord), and Saphira will try kill Merlon? I remember that mission the Ironfist have two lanes of undead ally, Cora was on right side, Merlon left, and you control Vail on center, maybe in the True Story Cora and Vail switch sides? I think that skill of summoning Kome knights will work same if put on Gardon or Cora, because in SHB Cora spawn along koma knights in "Long Live the Queen", that an interestly plot.