If Sasaki was not Takeda Shingen... why would he be surprised by the identity of the assasin?
Also he is mentioned as "samurai known as Hamano Michiyo" - so it is not his real name... he could be a traitor...that would align with your line of thinking... but the question remains on why he would be surprised by the identity of the assasin....
to be honest i do think Sasaki's reveal was a fake and the real Shingen is still alive...
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