Well there is a whole list to choose from ... most improved meaning have to have been on the list last year.
I have tried to create a poll but have never done it before so apologies if it does not work.
My money would be on Jetta as he has always had niggling injuries that have prevented him from consolidating a spot/role.
He has had a full preseason and has the skills, I see him as an aggressive Bennel which would have been something! he has the foot skills, speed, courage, endurance and versatility. I would love to see him beat Nicho for the small rebounding defender/wingman - I remember in the NAB cup he delivered a beautiful low pass to a leading forward after a run through the midfield .... sadly a rare occurrence at our club. Blease and Watts are also ones that I think are destined to improve this year - safe dream team choices.