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what I have heard that becoming a hollow has something to do with losing your heart.
So my theroy is Ichigo loses his mother that breaks his heart along with the bite that may of started an infection. Down in the pit he was begining to lose his heart there for the first meeting of the hollow spirit.
As for Zangetsu his form i.e. what he looks like is just what form a spirit guide for Ichigo would look like. Hence Renjis being an animal guide. I believe the spirt can be the same for thousands of year therefore having the knowledge to guide.
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