Former Kitui Senator and Wiper chairman David Musila surfaced at the University of Nairobi on Tuesday during a lecture by Raila Odinga.
Mr Musila, who has taken a low profile since losing to Charity Ngilu in 2017, accompanied the ODM leader for the launch of Prof Anyang' Nyong'o's latest book.
After controversial Wiper nominations, Musila who lost to Julius Malombe, dramatically resigned from the party, cutting links with his long time ally Kalonzo Musyoka.
Wiper party replaced him with Makueni Governor Prof Kivutha Kibwana, who has also since quit the party. He was replaced by Chirau Ali.
During the lecture on Tuesday, which also saw James Orengo, Gitobu Imanyara, Paul Muite among others attending, Raila rooted for parliamentary system of government.
It is also established that electoral violence is more frequent under presidential regimes than parliamentary regimes. People lose contests for parliamentary or county seats but it never degenerates into widespread violence or any at all," he said.
Mr Odinga added that Parliamentary system is promotes consociationalism which helps to bond countries with diverse cultures, tribes and races like Kenya.
"A Parliamentary system is viewed as a better way to raise the majority threshold in a country where tribes view each other with suspicion in the contest for power," he said.
"Parliamentary system is generally suitable for plural societies; that is societies in which the political landscape is composed of diverse cultural, religious, ethnic, racial and regional interests, and that is what Kenya is," he added.
Ever since he exited from Wiper, Mr Musyoka has been struggling to contain unsettled Ukambani region, with Governors Alfred Mutua, Kibwana and Charity Ngilu leading rebellion.