The only player in that list who has elite potential is Sam Reid. Hannebery has the potential to be an excellent player, Bird and Parker have the potential to be very good with excellent patches of the year, Jetta has the potential to be solid to good. I never got to see much of Rohan at junior level and don't feel confident making judgments on him yet. Luke Parker does have a higher ceiling than what I have given him here, although he'll never be an elite midfielder he could be in the next group, but I just regard him as more likely to be very good
In my humble opinion I think it would be wrong to put a ceiling on parker, I think he'll be an elite attacking midfielder once he reaches his peak, and I think he'll reach his peak early as well.