For DCLs:
The first person in the stateroom can be all on points and all the others in stateroom can be in cash, based on a rate that
DVC and
DCL negotiate.
The first two people in the stateroom can be on points and all the others in stateroom can be in cash, based on a rate that DVC and DCL negotiate.
etc
In other words, you must pay the highest points rates first in points and then the others (2nd, 3rd, etc) can be at a lower cash rate, if you are using any points for a DCL stateroom.