zola is decent player with a lot of potential - he just seems to have a lot of bad luck with injuries etc. If he could just improve his finishing, he would be capable of scoring a lot of goals, because he gets in the right positions.
him and curran would be a could partnership, as they worked well together last season against Brentford. I also think Zola's style of play is suited to playing with Curran. Curran is better than Greenacre, but I dont think Curran and Greenacre are suited to playing together, neither of them is very physical and they have a similar way of playing.