The owner of CR Airways has some kind of interst stake in Rainbow. No I do not fly the CL604, CR and Rainbow do not share crews. As for coming down? Sure come to the head office and ask to speak with the DFO or CP. Good luck on your application. As for the CRJ future? Well, I would suspect that they will be gone soon, makes no sense to operate the CRJ when you have 737s.
Anyway, as for the salary package? No one knows yet if its going up or down.
Cheers