Zig Zagged: Mu'alim gave Bob powers to carry out his quest, then Bob discovers he already had powers, only for Mu'alim to reveal that he gave Bob a hidden power to save him in the final battle... and it's Heart.Great, just great.
Averted: All heroes learn, awaken, or (in case of Anti-Hero) steal their power, on their own.
Making the concept of super powers more humane: it's given by someone who, despite great power and moral superiority, is more or less an approachable person; he or she who expects the heroes to use the power responsibly.
Discussed: "If this were a fantasy anime, we would have run into an old man with cryptic prophecy and an offer of power. Unfortunately we're not some kind of exalted knights going after a mythical dragon, we're patrolling this highway from bandits."