Board Thread:General Discussion/@comment-10674901-20130610071228/@comment-10922879-20130616095445

My theory is that old man zangetsu was not showing Ichigo the real powers of his zanpakutou until now as zangetsu limited that power after he fused with it and the hollow inside Ichigo(they already said that they can fuse with each other as they are Ichigo's powers), as he did not want Ichigo to become shinigami so he limited his own power (the quincy power), the hollow power and the shinigami (zanpaktou) power. So taking that Ichigo did not know about his quincy powers or that his mother was quincy, he did not teach him the quincy powers at all. So what he feared happened after 16 years from his birth when Rukia gave him her reiatsu so to make himself dominant over the shinigami (zanpaktou) and the hollow powers, old man zangetsu absorbed all of her reiatsu and limited it. At one point due to the excessive use of the hollow's powers by zangetsu ,unknowingly, the hollow became dominant over zangetsu and that is when Ichigo went to the vizards. Being fused with the shinigami, old man zangetsu knew about FGT. He did not use the quincy powers so Ichigo won't know about them and so he only used hollow Ichigo and shinigami powers to prevent Ichigo from learning FGT. Although it will fullfil zangetsu's intentions to prevent Ichigo from being a shinigami if he learned fgt (as he would lose his powers),he did not want Ichigo to learn fgt as he loved him so much that he did not want to say farewell to him.