However, Mogusu emphasised the importance of continuing to compete in ekiden marathon road relay at college level, under the guidance of the University coach Ueda.
[1] He had his first major circuit win in July 2005 when he won the Sapporo Half Marathon, recording a personal best time of 1:01:28 and beating Olympic medallist Erick Wainaina among others.
[2] Further success came in December when he teamed up with Josephat Ndambiri, Martin Mathathi, Daniel Mwangi, Onesmus Nyerere and John Kariuki to run at the Chiba Ekiden.
[9] He did not make the Olympic team but he continued winning on the road racing circuit, leading the Sapporo Half Marathon from the 4 km onwards to take his third victory on the course.
[11] At the 2009 Kagawa Marugame Half Marathon, only Daniel Gitau challenged Mogusu, but his front-running tactics prevailed as he maintained his lead to the finish to win his second title with a time of 1:00:37.
[15] He was runner up at the Kagawa Marugame race in February (losing to Daniel Gitau) and was again the second-placer at the Sendai Half Marathon in May, running 1:01:34 to finish behind Martin Mathathi.