Relics are done for I mean really, who uses Amano now except to show they made one lol. Though i might make GS I think it'll be fun to use.
Stop regurgitating anything you think you know or have read, what you are saying holds no water because you're not providing any proof of your claim.
Fudo and kaiten are both 60% str ws and their base damage is roughly even, fudo is a 3.65 ftp, and kaiten is 3.0. Thats a 21.6% difference, kaiten has a 25% ws increase which means these ws are near identical.
What fudo has over kaiten is the 25% tp bonus earring and any access tp you might have. Along with the upcoming JA that gives a tp bonus every 5mins.
What amano offers is utility in its accuracy and perhaps a 5hit in the near future with its aftermath that doesnt reduce its effectiveness. Amano is probably the best thing to use on VW, assuming you can melee on them long enough, esp if the acc is the difference between RCB and pizza/sushi.
Masamune is more of an abyssea/old content/capped acc weapon, its still great and probably is not that far behind Amano when Amano is ahead.
Whether its going to be relics > emp or emp > relics is to be determined in the future.