Toa's story would have been more impactful if Nito hadn't become instantly OP in the dungeon. After a couple of hours, at max, I'd estimate, he was the king of the dungeon. Imagine if he had actually struggled mightily for days and weeks, barely surviving encounteres with hopelessly overpowering monsters by hiding and fleeing. Perhaps he would have needed to use crafty tactics to slay some nasty giant rats to get something to eat. That way he would have, slowly, gained levels. Instead he walked for a bit and then got the potion and killed the mimic. The rest is history. Toa made it sound like Nito's journey through the dungeon was somehow far more arduous and inspiring.