He is Labour's candidate to take on Mr Harawira for the fourth time in November's election and is confident of winning the seat, after reducing Mr Harawira's majority from the 6308 he held at the 2008 general election.
Mr Davis has given up his job with the Ministry of Education, bought a new suit - he has become "more muscular" since his exit - and is ready for another ride in Parliament after saying in the wake of his 2011 defeat that he would not be back for another tilt against Mr Harawira in 2014.
"I wasn't going to come back after 2011 but, after reflecting, I feel the message [about Maori being successful through education] is still the right one. It just didn't get enough traction last time," he said.
"I know what I'm going into this time and Maori education is going to be a big part of my kaupapa again this time."
Mr Davis said recent sexual abuse and violence cases in the Far North, such as that of Pamapuria School deputy principal James Parker - who is serving preventive detention on more than 70 sexual abuse charges involving 20 victims from the school - highlighted that more needed to be done to protect children, women and families.
Mr Davis was originally headhunted for Labour by Mr Jones and, while sad his own return was due to Mr Jones' departure, he acknowledged it would help in his fight for the Te Tai Tokerau seat.
"Being an MP will give me a higher profile and I can use my resources to help get elected as MP for Te Tai Tokerau."