Is there a chance? Who knows. There really isn't any precedent that covers this situation. A holding company sold a wholly owned subsidiary to another non-air carrier. There is no air-carrier involved in the transaction other than Frontier Airlines, Inc. This isn't a covered transaction in the eyes of McCaskil-Bond or the two remaining LPP's of Allegheny Mowhawk.

The RAH pilots work under their own CBA.
The F9 pilots work under their own CBA.
There hasn't been any integration of the two airlines, in fact the two have been slowly become more separate over the past two years.

If RAH sold CHQ to Indigo it is obvious that the RAH pilots would go with CHQ as they are all employees of RAH and they all work under the same CBA.

RAH sold Frontier to Indigo, none of the RAH pilots are employees of Frontier as defined by the F9 pilots' CBA and none of the RAH pilots work under the F9 CBA. I don't see a mechanism for anyone other than F9 employees to "go with Frontier".

There is also the issue of "the 7 year fence" that ends in August of 2018. The IBT is currently attempting (yet again) to burrow under the 7 year fence and they continually refer to it as a "captain fence" even though that language is no where in the Eischen Award. If the Frontier pilots have "priority" for all Airbus flying until 2018 and the Airbus flying is sold, logic seems to dictate that the Frontier pilots will retain their priority and "go with Frontier".

We will find out soon enough.