I've watched Kadeem play a couple games for the Claws this year and I haven't noticed anything too special about him.
He is pretty athletic and strong, and has good anticipation on defense. But exceptional? I dunno.
From what I've seen it might not be enough.
Rozier a couple years back really stood out during his D-league stints. He was visibly faster, smarter, and more skilled than the other players on the court. He made ridiculous steals and plays on loose balls. is footwork in the lane was remarkable. The sort of stuff nobody else could do.
Mickey could visibly control the paint.
Nader could bring the ball up the court reliably and then run an offense as a SF (to a degree). He was also versatile enough on D to cover most opposing offensive players.
In the G-league, it's not the stats that matter so much as it is the specialized skills. Can you dominate in at least one area, and be at least solid-to-good in others? Is your athleticism or skill level dominant enough that it could lead to major developments in other parts of your game?
Kadeem looks good on D, and his steals totals are excellent at 2.6 per game in ~35min.
I don't know though if it rises to the level where he could have value against NBA teams. His offense is mediocre for a "good" G-league starter. With that in mind, his defense would have to be outrageous to compensate for this flaw, especially at his height (6'3"). And he doesn't have, say the raw strength of a Marcus Smart out there on D, or the pure quickness of a Rozier, so it's hard seeing him being able to rise much higher in the ranks given his deficiencies.
Oh, and he's also somehow 25 already