What is the significance of Ikemefuna's life and death in Okwonkwo's household?

Ikemefuna was sent to Okonkwo's household to await his
time to be sacrificed for the compensating of the woman that was murdered by the Mbanta
tribe. Ikemefuna became a type of double sacrifice. He lost his family or they lost him.
Also, Okonkwo had grown fond of Ikemefuna. The boy called Okonkwo
father.

When Ikemefuna was sacrificed, Okonkwo was
instructed by a clan member to not take part in the
sacrificing:

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That boy calls you father. Do not bear a hand in
his death.

Okonkwo did not
want to appear weak. Out of fear of appearing weak, he took part in killing Ikemefuna.
Then Okonkwo could not sleep for days. Fear caused Okonkwo to react
violently.

Ikemefuna's sacrificial death was a type of
foreshadowing of Okonkwo's own death. Okonkwo killed Ikemefuna out of fear of being
thought of as weak. Likewise, Okonkwo hangs himself out of fear. Because his clan would
not fight the white Christians who were taking control, Okonkwo could not live with the
changes, thus he hung himself. Out of fear, Okonkwo reacts violently. He killed
Ikemefuna out of fear. He killed himself out of fear. He died without honors, just as
his father Unoka.