Hitomi gives him problems too with her large amount of delayable strings, plus she's pretty safe in this game, 236K being +3 among others. I honestly think hitomi is the best character in doad.
Well yeah 46T is never a better option on high counter than an izuna, maybe if there's some powerful dangerzone behind you like on scramble or somethin.
Pretty sure Ryu, being part of the dragon lineage, is unique in that he is descended from dragons. I think him and his father are the only living descendants. The rest of the hayabusa clan are just ordinary ninjas. I'm not totally sure about all this though.
The vf chars are some of the best chars in the game, what's to complain about here?
Plus sarah was low tier in vf5, why would you want that sarah in doa?
I think the best thing to do if they did a remake would be to not change anything about the actual gameplay, maybe add some new materia, make it more difficult, some more optional bosses, but that's it.