Don't be fooled by the fact that all three of their fathers have Cold Resistance Level cultivation, important resources like the Hundred Forged Level Saber aren't something you can obtain easily, let alone the highly strategic resource of the Hundred Forged Battle Armor.
The three broke through to the Earth-digging Realm just half a year ago, and although they've already joined the Hunting Team and amassed considerable wealth, it's not like they could have easily switched to the Hundred-forged Great Blade.
The issue is that Hundred Forged Level Weapons aren't cabbages; even if the Craftsmen Department forges them, it takes time. Every batch sent to the Camp Supply Department is immediately snapped up, leading to a supply shortage.
To deal with this situation, the Camp Supply Department has had to establish a rule prioritizing those with higher Basic Strength for exchange, so even now, none of the three have gotten hold of the Hundred-forged Great Blade.