Pickett is not a great natural athlete. Not bad, but Malcolm is a fair comparison: average to slightly below average for a P5 wing. That's just in a run-jump sense, though: Pickett has good coordination, reaction time, etc. Important athletic traits; he's just not going to wow you with blazing speed and highlight reel dunks.
He's a so-so 3-point shooter, but not a poor one. Should be able to shoot 30-35 percent, provided he adjusts to the speed of the college game.
Look, there's a reason that Pickett is ranked in the 200-250 range: he's a skinny wing with limited athleticism who's not known as an outside shooter. There are also reasons to be very excited about him: 1) he's got a nice frame and has really matured physically over the last 12 months, 2) his shooting form looks decent and he's improved a lot as a shooter, 3) while still not a dynamic athlete, he's improved a lot in that domain as well, 4) regardless of limitations, he's got unbelievable scoring instincts - like Malcolm, he's just a bucket-getter, and 5) most importantly, he's a very high-motor player. He's got a Chet Frazier level motor.
The arrow is pointing up for Javon. A year ago, he was a great high school player without projectable attributes. He's gotten taller, added muscle, improved his shooting, improved his athleticism, and continued to play with energy and tenacity. He should be a contributor as an upperclassman.