In the buildup to the 2016 Summer Paralympics in Rio de Janeiro, Nambala took part in the 2015 IPC Athletics World Championships in Doha. He took another two World Championship medals, a bronze in the 400 metres, despite posting a faster time than won him the title two years prior, and a gold in the 200 metres. He followed the World Championships with his first African Games, competing in the 400 metres. His time of 48.49 was enough to beat his nearest rival, Algeria's Abdelatif Baka, to claim the gold medal. The next year, at the Rio Paralympics, Nambala entered three events, the 100 metre (T13), the 200 metre (T13) and the 4 x 100 metre relay (T11-13) He won two medals, placing second in both the T13 100m sprint and the T13 400m sprint.