16 Iyar (Behar-Bechukosai)

The Toras Kohanim says that Vayikra 25, 48-49 is written in the order of relatives who redeem someone who is sold to a Gentile as a slave, the closer relatives come first and than the more distant relatives. Why is the slave himself listed last in the list of who's considered the closest relative. Seemingly he's the closest relative to himself!