Little unsure what your asking,
do you mean what would happen if the MSCS that has been setup for CAB was put on a single host? so was setup for CAB but was sitting as CIB?
If that the case then I can tell you from personal experiance it will "work" but its very very flakey and issues will arrise mainly with failing over of resources. While we had SAN issues with locking disks moving them to the single host so that is was the same HBA worked but wasnt great.
Cheers
