Important thing is to factor on what he does well:
-Elite athletically
-High Level scorer
-Led country in assists so can run an offense
-highest PER in college basketball
-performed at his best against power five opponents
-super competitive/chip on shoulder
If it were just 2-3 or those things, I'd be more skeptical. Put all that stuff together and he just seems like a guy who is likely to make some sort of impact in the league, hopefully with the Cavs down the road as a PG off the bench who can both run the offense in short stints and provide instant scoring.
If he can do both of those things, than in the right lineups, his height disadvantage on defense can be mitigated.