Two cents, two points:
1. From a logistical standpoint, the Hast & PER are closer to CPC so I'd give them the nod vis-a-vis the task of augmenting CPC.
2.a. Once upon a time the jump course was more readily available - in essence it was an incentive, and nominees were considered to be the "top soldiers" from any given unit. I'd prefer to "spread the wealth", as opposed to restricting it to only one unit.
2.b. Another consideration to the problems associated with having all one's eggs in one basket is that of augmentation to operations - there are still many reservists who are either unavailable or unwilling to volunteer for operations. As such, if the parachute capability is limited to only one unit, the statistical probability increases that parachute training would be wasted on somebody who will never deploy (and, last time I checked, the Army was trying to not waste money ...). Conversely, by distributing jump course vacancies more widely, better selection criteria would ensure ouir money is well spent on training the right soldiers. The reason I mention this is because last year the Ontario unit that deployed the most troops on operations wasn't the QOR.