I am just saying, that it was stated before, that Angelus was the most powerful (at least that Abel created, and when you consider who and what he was, there are not many since who could likly achive as much). It is like saying someone is the best at something, and then saying that someone else is just as good. You can't have it both ways.
I don't recall where I read about Angelus as that, possibly Gaia Vol 1, but I am unsure. I do understand the eveolution of a world; history and the like are harder than the rules themselves. Some continuity would be nice, thats all I am saying.
Reading through Gaia, there is a brief text underneath the Angelus stating "The Angelus: the final and most powerful weapon conceived by Abel."
I honestly wouldn't put too much stock in "the most powerful" anything in Gaia. Seomon and Angelus are twin weapons with similar appearances and abilities, and both are stated to be the most powerful weapons ever in their defining texts, but Jared is widely "believed" to be the most powerful Legislators by its own text.
To keep things proper, I would take that the translator posed to its specifics: That it shares similar appearance and powers. Like all twins though, there are some differences, and in all likelihood, Angelus, is the 'older twin' and likely bears some power the others done; simply by being carried by Abel likely conferred something other than its 'base' powers.
I imagine that it was mostly Abel himself, and not the sword that was the source of its superiority. Abel forged the Lawgivers himself, and I doubt he would add something "extra special" to just his, especially when he created a near identical sword for his best friend.
Now, a question about Seoman. As the Imperial Sword, and in essence the 'Crown' of the Empire, do we know if it chooses its weilder in any way? Is that any part of the lore? The whole story behind the intermingling of the CHurch and Empire is always interesting to me, and if there was some sort of known property of Seoman, like it can only be wielded by the Chosen of God to lead the Empire or such, then well, you can see the implications for the Church!
It does not choose its wielder, it was created by Abel for his first apostles, Pietro Giovanni. As the Giovanni bloodline is the one that founded the Empire, his sword is the symbol of the Imperial Crown, which up till recently, was held exclusively by the Giovanni.