Rowenna Davis, a journalist from London and former Labour councillor, replaced him as the party's candidate.
The Lord Mayor, Mike Gibbons, who is a Conservative councillor, confirms the project is finally due to open as the city experiences a welcome upturn in fortunes.
Brennan, currently a councillor in east Dundee, is seeking to overturn a majority of 1,821 held by the SNP's Stewart Hosie.
On Tuesday, Laura McNamee, a fellow Alliance party member councillor said she had been forced to leave her home in east Belfast due to threats from extreme loyalists over the city hall flag vote.
Neither councillor ended up in court because they arranged payment plans with the council before the case was called.
Other strong parliamentary hopes include Darren Johnson, who is a London assembly member and a councillor in Lewisham, who will contest Lewisham Deptford, and Adrian Ramsay, the party's deputy leader, who is fighting to defeat former minister Charles Clarke in Norwich South, where the Greens are the official opposition on the unitary council.
It would also give a major fillip to the city's 10-year plan to deliver 7,500 new jobs, something that Steven Bayes, a Labour councillor, believes would be a "tipping point" for Hull, as most of the positions would be created in the service sector and require little training.
One was the son of a local Labour councillor Shakil Ahmed, who said he was "shocked" to hear of the arrests.
The councillor is making his rounds, quietly soliciting from his neighbours their troubles and concerns.
Back in 2011, 18-year-old Jake Morrison made headlines when he was elected to the council there, becoming the youngest councillor in the country at the time.
"Within four years as a councillor I've influenced a change in government policy, spoke to thousands of young people in school and made a real connection with my constituents, who trust me as a person who is capable of representing them".
