Its easy to get swept away by a young prospect/contender type, its easy to see weaknesses after he gets smacked around.
So just looking at what some top young guys have that are problematic and need to work on.
Juan Manuel Lopez-The man. In love with the straight left-right hook combo, in love with it, almost throws nothing else besides that and the jab. Might need more punch variety. How would he react to a boxer mover safety first type fighter, he's gold against guys that come to fight but will be interesting to see how he reacts if he has to press a fight. Chin kind of unknown. Not extraordinarily fast but seems to have great timing.
Lamont Peterson- A bit flat footed. Could jab more. Only one real form of defense. Maybe doesn't have a second gear to go to and maybe doesn't have the power to turn around a fight if he's fallen way behind.
Anthony Peterson-some of the same stuff except maybe the power. Oh yeah, needs to fight somebody.
That's just a couple, add your own. And seriously I'll neg rep you for creativity issues if you say Amir Khan has chin problems.