Putting JC aircraft on the VH register created an extra 10 mainline commands and F/O slots. Such was the inefficiency of the JC 737 operation. Of course, this exacerbates the shortage of crew on the 737 as the aircraft start to be rostered more efficiently prior to the mainline crew having been trained.
It also forgets the additional 50ish commands and F/O slots should’ve gone to mainline given the need to wind up an operation that was obviously so inefficient. We’ll see what happens over the next few years as JC struggles to attract and retain qualified crew.