[5] Sepeku remained bishop of the diocese of Dar es Selaam, retaining office while also Archbishop of Tanzania, until his death in 1983.

He left an Arabic-Swahili style 3 bedroom house with an inner courtyard in the busy town of Korogwe in Tanga, which he had bought in his early service as priest in the 1960s.

During his service, he facilitated the study abroad of the then father Valentino Mokiwa (a Mzigua from Tanga) who was elected in 2002.,[8] as the fourth Bishop of Dar es Salaam.

[9] Valentino Mokiwa, a graduate of Virginia Theological Seminary, became bishop of Dar es Salaam in April 2002.

The contestants were the evangelical Jacob Chimeledya and the Anglo-Catholic incumbent archbishop of Tanzania and bishop of Dar es Salaam Valentino Mokiwa.

[10] On 2 March 2017 Chimeledya licensed Augustino Ramadhani, a former Chief Justice of Tanzania, as a priest of the Diocese of Mpwapwa and appointed him to lead St Albans Cathedral Church in Dar es Salaam in place of Mokiwa.

[10] Sosthenes had been educated at the evangelical Trinity School for Ministry in the United States and was seen as a supporter of Archbishop Chimeledya.