"Our JCBA does not provide for any "fences" nor "grand father rights"."

First you basically don't understand the process of integration because it has nothing (or at least little) to do with the Contract. The Contract covers how we get paid, work and benefits while the integration is an agreement about how the two pilot groups will be merged. The ISL process is a legal and binding agreement not just between the two pilots groups but also the airline.

UCH is bound by the ISL and its contents as much as they are bound by the Contract. As I said one address the pay and such while the second is an agreement on the process of merge. If the arbitrator assigns protections like fences, freezes and base staffing then UCH is bound by that agreement. Their only recourse is to grieve the ISL agreement through the court process in the same manner we pilots have available to us.

You also have to understand the fences, freezes and base restrictions are not cost negative to UCH since the staffing will cost the same regardless of which pilot group is effected by it.

Yes there most likely will be restrictions beyond an integration of seniority.

Oh and I do have experience in negotiating a merged list of two pilot groups, so I know from where I speak.