As the topic says, what skill are you using with isshin? I got him during dmg stacking bug so i didnt need to concern myself with it and i just used dark rukia + zabimaru + 9th skill but now I am not sure.. 8th skill seems kind of wasted, cant use 9th with rukia and sogyo so it looks like either 2nd or 5th... 5th has higher % but 2nd reduces def which I think works against ES because when I equipped zabimaru renji in the formation long time ago my dmg went up when he attacked first compared when he attacked last so what do you think?