Because it requires 'gaia the fierce knight' monster. That means you have to use gaia or another variant of it like swift gaia. So this fusion monster needs spesific request
Incorrect as you can use the same monsters to bring out Destruction Sword and it requires a Buster Blader + any 1 Dragon.
There is likely an error if it's not working.
It's not incorrect, you need a Gaia the Fierce Knight monster, which is an archetype. Swift Gaia and Gaia belong to this archetype, so you exactly need to use one of these two.
Fusion Tag doesn't help with Sky Galloping Gaia either, since it doesn't name any materials, and even if it did, Gaia the Fierce Knight isn't a Fusion Monster.
It does not replace Buster Blader anymore.
I have Buster Whelp , Destruction Swordsman Fusion and Goddess with the Third Eye in my starting hand going first. And I cannot fusion summon Buster Blader, the Dragon Destroyer Swordsman. Any advices??