ff last boss list

so how do u rank the last bosses of the ff games u have played in terms of hardness? here is my list (no ffIII since i aint got 2 Dark Cloud)

10-Shuyin(ffX-2)
9- Brasakas Final Aeon(ffX)
8- Ultimecia(ffVIII)
7- Kefka(ffVI)
6- Safer/Seraph Sephiroth(ffVII)
5- Chaos(ffI)
4- Emperor(ffII)
3- Necron(ffIX)
2- Zeroimus(ffIV)
1- Neo-X-Death(ffV)

1) Neo-X-Death(ffV)
2) Zeromus(ffIV)
3) Necron(ffIX)
4) Safer/Seraph Sephiroth(ffVII)
5) Kefka(ffVI)
6) Ultimecia(ffVIII)
7) Chaos(ffI) (well, that depends on your caracters job classes)
8) Brasakas Final Aeon(ffX)
9) Vegnagun/Shuyin(ffX-2)