Well that is a huge difference in pay load. No point in sending a rocket here with out a nuke.
The article you link to says, “Pyongyang’s Musudan missile will eventually be able to reach Guam with a nuclear warhead. Experts think the KN-08 mobile missile may be able to place a small nuclear warhead on the West Coast of the U.S. by 2020”
They say they have a smaller sized nuke now - but then again Trump says his hands are normal sized.
But again, the US has hundreds of nukes currently pointed at it from Russia. While NK is a dystopian dictatorship - it wants to stay that way. They will continue to use their show of force to keep their people rallied for the cause. Kim isn’t a complete idiot. He knows if that were to happen it would end him one way or another.