Watching some Crossen tape today. Even though he's short (just 1/8 over 5'9"), his arms are long - 32 1/8." His arms are longer than Josh Jackson (by a full inch), Minkah Fitzpatrick, or Quenton Meeks, even though those guys are over 6'0".
On the other hand, his footwork is sloppy and his reactive athleticism is a beat slow, so he doesn't mirror nearly as well as his agility drills would suggest. He's great on vertical routes but he just grabs when guys change direction on him.