Glad the union finally put out in writing how this scenario would work. It looks like the union guy I talked to was correct. If you get displaced to CA, you will only be allowed to hold an unfilled seat.
Once/If all proffers to displace are exhausted and unfilled vacancies remain, the parties will tally the number of unfilled vacancies. Starting at the bottom of the seniority list, the parties will identify a sufficient number of the most junior qualified pilots (working from most junior to most senior) and place them into a pool. The parties will then turn to the most senior pilot in this pool and involuntarily assign him/her to an unfilled vacancy that best matches his/her displacement preferences. If the pilot has insufficient displacement bids, or if his/her seniority can not hold his/her requested statuses then he/she will be assigned a status per the needs of the Company. This will repeat in seniority order (from most senior to most junior) until all the unfilled vacancies have been satisfied.