You are quite correct, Highlander II, about Morgan. He has great courage and internal integrity. He is a righteous dude, which drives most people up the wall and he sticks to his guns until he is definitely proven wrong or at least the need to rethink his position.
I agree that he has grown in my estimation, as well. We know that he recognizes Harry as having a great integrity and a soft spot for victims. Otherwise, he would never have darkened Harry's doorstep even in extremis. That alone tells us the extent to which Morgan has reevaluated one Harry Dresden, Wizard. Yes, Morgan's sword would have to be Amoracchius. The Katana is not his type of weapon.
I do not see John Marcone as being eligible for a sword. He is an ends justify the means and the vilelness of the means is irrelevant to him. That pretty well disavows his eligibility in my mind.
I have very mixed emotions about Karrin being a weilder of Fidlelacchius. She is a small woman. She is strong for a woman her size, but that cuts no ice in hand to hand combat with a dude who is good and will be a lot stronger. She will lose not just once, but virtually every time in real life. I do think that JB is quite aware of this and will not go PC on us.
If women matched up to men, then why do they not box against men, and why do they not compete against men in full contact martial arts? The reason is that they always lose. The same thing is true when it comes to the art of the sword. There is a good reason why the Naginata was the weapon of women. It is a standoff weapon, but if the opponent gets inside, you are dead. The caveat is that if it is used as a pointy quarterstaff, then she has a chance against any swordsman. A quarterstaff user will wipe out almost any swordsman.
Size and strength matter.