Why did Matt Damon not play in The Bourne Legacy?

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Tags

1. #chose
2. #mentioned
3. #several
4. #fourth
5. #character
6. #bourne
7. #greengrass
8. #shown
9. #legacy
10. #titular
11. #return
12. #times
13. #directing
14. #actor
15. #damon
16. #throughout
17. #pictures
18. #appear
19. #jason