First Adam Morrison:
Weaknesses: Not especially gifted athletically ... Lacks great foot speed getting out into transition ... Runs decent, but needs a head of steam ...Better hand speed than foot speed ... Leaping ability is average ... Plays hard on defense but lacks great lateral quickness ... Lack of a great first step will make it harder to get shots off against superior athletes ...
v.s
Weaknesses: While Parker is a good all-around athlete, he won't be much of a stand-out as far as the NBA is concerned ... His first-step lacks the explosion of some of the other elite-level prospects he's often compared to, and he won't be labeled by many as a "high flyer" either ... If he works hard on his strength and conditioning, he should be able to maximize his potential athletically as he grows into his height, but even for a player with a reputation like Parker, this is still an “if” ... Parker's outside shot can be inconsistent, though at only 16 years of age, this is a common issue, and can be rectified with practice and experience ... He's drawn comparisons to players like Paul Pierce and Carmelo Anthony, and those kinds of expectations can weigh heavily on younger players ...
So while any player can bust, and Jabari could indeed blow up in people's faces, the assessment of their athleticism, etc, was very different prior to being drafted. Notice btw that the Jabari Parker weaknesses are 2 years old, and some of those aren't even true any more.