Its proper & moving JCC jr to 168 #1 is a polite way of pushing him out of 160, something that he was able to do...When his Godfather was around
Well, that's generally what should happen when someone is neither planning on defending the title nor able to make the weight.
This is the rule anyway, if you move up in weight you can have one fight while the belt remains with you. Any more fights above and you're going to get stripped.