Artifact aram earings were also used and also some guardian equips with unknown encahnt and sc option which he claims that he bought from the market.
And yet the point remains
miraculously moot. Hypothetically, yes, you can unseal stuff at Artifact. None of these are unsealable items, true--so we'll drop that. On that note, how gigantic of a difference do you think, against Bone Dragon, a
full Guardian set would make? How about Aram Earrings? If you want to argue Soulcraft options, unless someone has "Max Physical Attack + 100,000%" on their earrings, I am pretty sure no other option is going to be
the golden ticket to victory. This isn't to say that his demonstration may not have been a bit flawed, because he could prove it just as easily if everything was green and it was indeed Storm's fault to assume people could make this distinction of Soulcraft usefulness. As for enchant on Guardian equips, I won't bother because any enchant on them would be extraordinarily small in terms of defense at the time, and even the full effect of the set or a combination to get the Agility would prove insignificant.
An indication: why do you think we "stack" stats? It's because, alone, stats are just as useless as Strength. If you have only one piece of equipment that has agility on it and that is all you have with Agility--here's a large surprise for you: your agility isn't going to do anything.