If they had 1 defense each, Zophar would need to reduce Heroes by 9 offense, which is a bit much. I don't want the chain to complete itself just by drawing Eliphaz or Job would get punished a bit too much.
There isn't much wow factor in these cards, but they're quite good when you really analyze them. Eliphaz and Bildad give you a CBN 3/6 band and keep your next draw safe from Mayheming among other things. Zophar can drain a Hero's offense and bolster your Job's Wife or other FbtN EC at the same time. After just one use of Zophar you can have a 6/14 FbtN EC.