In The Lekki Headmaster, Mr. Ogo's story ends with his arrest for murder. Mr. Ogo is a character whose actions throughout the novel lead him down a dark path, and his eventual arrest represents the consequences of the criminal activities he becomes involved in.
His fate serves as a cautionary element in the novel. While other characters pursue migration or try to navigate the difficult Nigerian education system through legitimate (if sometimes desperate) means, Mr. Ogo's trajectory shows what happens when a person crosses fundamental moral and legal boundaries. His arrest for murder is the ultimate consequence of his choices.
The other outcomes listed do not apply to Mr. Ogo. He does not successfully relocate to the UK, become a pastor, or open a new private school. His story arc in the novel concludes with criminal accountability, reinforcing the author's moral framework in which serious wrongdoing leads to serious consequences.