Hidden rewards
Eventually the Devs moved all quest loot to visible EXCEPT the Epic Troop Token in Recruits II.
See post:
(Missing Troops Token from Find Recruits 2? - #32 by Gryphonknight)
Trivia, If you track quests, the difficulty changes each spawn within a set range of team power.
Bonus
IIRC that is a recent change. Maybe just a display bug.
Or the display code needs to be rewritten for multiple Trainer heroes.
The Season 2 missions also have hidden ascension items.