Wahaha! It does seem ridiculous if we think about it that way.
Most RPG games and anime with leveling system have the protagonists fought tons of fodders before they meet the big boss, even though they're supposed to be the demon's biggest threat
In page 21, 1st panel:
Then in his own logic, the hero who was summoned and granted prowess should be able to use the "identify" skill. Here comes a plot hole.