CMV Confusion

Can someone explain something to me please. This is a bit confusing to me.

Part 390 on the fmcsa regulations site says
Commercial motor vehicle means any self-propelled or towed motor vehicle used on a highway in interstate commerce to transport passengers or property when the vehicle -

(1) Has a gross vehicle weight rating or gross combination weight rating, or gross vehicle weight or gross combination weight, of 4,536 kg (10,001 pounds) or more, whichever is greater;

But then the definitions under Part 383 state;

Commercial motor vehicle (CMV) means a motor vehicle or combination of motor vehicles used in commerce to transport passengers or property if the motor vehicle is a -

(1) Combination Vehicle (Group A) - having a gross combination weight rating or gross combination weight of 11,794 kilograms or more (26,001 pounds or more), whichever is greater, inclusive of a towed unit(s) with a gross vehicle weight rating or gross vehicle weight of more than 4,536 kilograms (10,000 pounds), whichever is greater; or

(2) Heavy Straight Vehicle (Group B) - having a gross vehicle weight rating or gross vehicle weight of 11,794 or more kilograms (26,001 pounds or more), whichever is greater; or

These 2 seem to contradict each other. I have a driver with a regular passenger license driving a small box truck with the gvwr of 19,500 lb. Would he be allowed to drive this truck or would he need a commercial license?

 

Thank you very much for your explanation. Makes much more sense now.