The intelligence part probably is functionin properly , but he is booming yet actualizing ratings you find valuable slowly . Under defaults he gained 7 points of current during 2 camps and 6 during games.

He will pick up another 6 this year and won't jump so much in those key ratings based off your weights next camp. If those key ratings were closer to the potential his current overall rating would look closer to the potential .

Or if you valued other static ratings lower...like speed or whatever this guy is good in.