what the NBA would say: if you are a junior or senior and can't dominate freshmen/sophmores defending you (ie, get your own shot, run an offense to get someone else a good shot, etc), then its rare to see that click so late in college. Not unprecedented, but rare, and probably even more rare without some sort of athleticism advantage to build skills and decision making off of.
Injuries could potentially give them an unfair appraisal at this point, but what i'd anchor to are two things: 1) Zak's shot selection/decision making is not injury dependent, and 2) DW's complete inability to score at the rim is not injury dependent. If either of those things improves though, i think a jump can be expected b/c it means the offense is going to flow more easily, better looks, less forcing things, etc.
I still think the team's ceiling is high, but that's driven by a lot of returning experience and talent, better/balanced coaching, and hopefully less by Z/D having to do too much.