The 19 is horrible but I would take an 18 year old 4/5 over a 5/4 without a moment's thought. Trust me perennial allstar potential just isn't good enough unless you are planning a SF and even then you will wish he was a superstar. If the 4/5 you don't pick turns out to be an all time great with great secondaries while you get a perennial allstar with awful OD but great PA and JS then you will regret it forever.
Lets face it the draft is a crap shoot you can draft a 5/5 discover he has all atrocious secondaries and fouls out in 24 minutes every game, ie: you can draft Gab Wall.