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I dunno about them being level, Isshin won every encounter they had pretty casually and didn't take any damage until Aizen went Chrysalis. Its not like he has shown anything that would allow him to block/divert the attack any way. No one even mentioned anything like that and I'd rather not assume he has another ability which will only cause confusion if it gets added somehow, seeing as none of us no how it works at all.
The one thing I can think of is Danku but Isshin hasn't shown any kido aside from low level stuff and it isn't a part of his fighting style or else he would have used it far more. There are plenty of useful Bakudo he could have used like Rikujokoro, Sajo Sabaku or Gochutekkan but he doesn't. A higher level kido is out of the question.
The one thing I can think of is Danku but Isshin hasn't shown any kido aside from low level stuff and it isn't a part of his fighting style or else he would have used it far more. There are plenty of useful Bakudo he could have used like Rikujokoro, Sajo Sabaku or Gochutekkan but he doesn't. A higher level kido is out of the question.