I really like this theory.
How rigid is the "only rogues can see magical traps" rule? Roy couldn't see the line even when Haley pointed right at it and told him exactly what to look for. Team Evil has far weaker clues, but bonuses and magical enhancements.
Spoiler: for Utterly Dwarfed bonus materialIt's sad to see one of Kandro's family heirlooms being treated so cavalierly.