Why did Ichigo's Zanpakuto change?

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Tags

1. #false
2. #ichigo
3. #given
4. #reason
5. #shikai
6. #zangetsu
7. #released
8. #zanpakuto
9. #never
10. #manifestation
11. #sword
12. #bleach
13. #always
14. #because
15. #learned
16. #powers
17. #fully
18. #quincy
19. #seems