Yes, per the FAQ, the Order was around level 8 when they entered the Dungeon of Dorukan, and thus around level 9 when they first faced the Guild. Z, however, was level 11 or higher when we first met him; he was able to petrify Celia with a level 6 spell.
This.Except that is the whole motto of the Linear Guild, disproportionate revenge. And we don't know how horrible WoTC Lawyer imprisonment was for Z.
EDIT: darn ninjas. And wielding links!