I do not think RAH's major feed partners want them as a competitor, nor do they want them to operate 100 seat airplanes.

The simple fact is that their feed contracts with RAH generally only apply to the operating certificate in question.

This means that in the case of DAL for example, RAH must comply with all DAL contract and scope limitations, but only for the Shuttle America operating certificate. Similar for their other partners.

RAH has a lot of operating certs and contractually they can do whatever they want with the ones which don't fly for their feed partners.