Ferguson led the league for metres gained last season with an average of 186 metres per game, a stat Moses believes will hold the Eels in good stead for 2019.
“You need those big outside backs to help out the forwards,” Moses told The Daily Telegraph.
“It has a trickle-down effect. The big outside backs get the metres and that means the forwards have a bigger impact because they are more fresh coming out of our own end. Then us halves can do what we need to do to help create points.
“That’s why Fergo is going to be big for us. We had George Jennings doing a really good job for us coming out of yardage but he was doing it by himself trying to come out of the back field.
“He was consistently running for around 150 metres and he was our best back.”
The halfback turned down the chance to attend the Khabib Nurmagomedov and Conor McGregor fight in Las Vegas to return to pre-season early.
Moses did attend the NRL Grand Final and said attending the game has made him hungrier to succeed with the Eels.
“I went to the grand final and did some things with the NRL there and it was pretty hard to watch.
“For us and the season we had to be at the bottom of the table and get the wooden spoon compared to the season we had before when were playing finals footy, it was hard to watch.
“I kind of take that as a lesson and use it as a bit of fuel for next year.”