>>282130139
Luffy defeated glowies, a “god”, and two warlords at the age of 17. Dragon killing a Holy Knight is not farfetched at all, perhaps with a devil fruit he stole (hopefully the wind-wind logia) from one of the treasure chests, which would explain how baby Shanks ended up in it.
As for Garp, he’s a boomer through and through, he grew up alone in the mountains beating up tigers and thinks this is the best way to build character. Makes sense he’d be a shitty father and grandfather, despite having a moral code and recognizing that what he witnessed in God Valley was horrible.
Maybe read the manga sometime? Connect the dots, have basic pattern recognition?