Firstly, it should be noted that Rick Gladiator is not your typical hero in the story. He is an "ossan," or middle-aged man who has recently taken up adventuring despite being young, inexperienced, and often underestimated. Despite these challenges, Rick is portrayed as a determined individual with hidden talents.
Secondly, unlike other heroes who rely on magic or divination for their power, Rick's strength comes from rigorous training that pushes him to his limits. His training has given him the title of being one of the best fighters in the land.
Finally, Rick's journey as an "ossan" newbie has taught him valuable skills such as strategic thinking, cleverness, and an appreciation for tactics that are often overlooked in his youth.