The former Sunderland, Leeds United and Hull City striker has had a positive influence on the squad and has been one of the main reasons the Jets have climbed to fourth on the A-League table according to Culina.
"Early on we probably missed some players on the park who could lead on the park by example and I think that started to show when Michael Bridges arrived - he was very good in the dressing room," Culina said.
"And that has carried on and when you start winning games there is no shortage of leaders."
The Jets were languishing down the bottom of the table in late November but have rallied to win their past three matches and hit the form that Culina knew his side was capable of.
"We have believed in each other all year it is just when the results are not going your way that you don't quite believe in yourself as you should and doubts creep in and before you know it you don't play the way you think you can, but as I said it has been a tremendous turnaround for the team," he added.
"It is very pleasing and it is a credit to the players and everyone around the club who have pulled together to make sure it is all possible. And it just goes to show that when you work hard and believe in yourself and each to show just what is possible."