actually i wonder how u initiate the communication. in ichigo's case, the first time... he entered the inner world without knowing how to. In zaraki fight, zangetsu appeared automatically. its like ichigo didt even ask for it o.o
anyway i dont think its as simple as zaraki holding back his reiatsu. In zaraki's case, zaraki hates his zanpakuto, his zanpakuto hates him. Their powers conflict against each other.
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