On the top end, my gut suggests Moore's ceiling is Kevin Gamble/7th man on a pretty good team.
Johnson will depend entirely on his defense. He must become a solid team defender and quick, aggressive man-defender. Even w/o ball handling skills, he could be as solid as a Tayshaun Prince on the high side, and Waltah McCarty might be a mid-range projection. Needs to get in the zone defensively, though.
Going forward either could play nicely next to JGreen, Bass, and an aging Pierce.possibly KG and Ray, too? For Pierce's last 2 years? Maybe KG, too?
How long can this keep going if these young guys develop by playing spot minutes this year, and are ready to step in and play rotation minutes next year?
Can they combine with Bradley, Bass, and Green to prop open the window for reasonably short money?
I love getting overexcited about rookies...it's the only thing I missed about the early years of Danny's reign.