If you don't have Nana, Atma of the Solitary One gives +30% Zanshin rate.
I updated the Zanshin page from this thread:
http://wiki.bluegartr.com/bg/Zanshin
Condensed so far, this is what I have for the skillchain JA:
JA -> Rana = Darkness (Distortion -> Gravitation)
JA -> Gekko = Darkness (Gravitation -> Distortion)
JA -> Fudo = Light (Light -> Light)
JA -> Blade: Hi = Darkness (Darkness -> Darkness or Distortion -> Gravitation - Can't tell)
JA -> Kasha -> Light -> Fudo -> Light (Fragmentation -> Fusion -> Light)
* Because JA -> Gravitation didn't make Gravitation, we know that Distortion is in front of Fusion in the order
* Because JA -> Distortion didn't make Distortion, we know that Gravitation is in front of Fragmentation in the order
* Because JA -> Fusion didn't make Fusion, we know that Fragmentation is in front of Distortion in the order
Distortion > Fusion
Gravitation > Fragmentation
Fragmentation > Distortion
Gravitation > Fragmentation > Distortion > Fusion