I don't know whether Flybe has a veto on the choice of Stobart Air routes under the franchise, but if they do then EDI and BFS would presumably not be approved for obvious reasons.
As Stobart's plan seems primarily to increase pax numbers through SEN I'm very surprised that DUB-SEN isn't being resurrected under Aer Lingus Regional branding. Considering that the route generated 62,000ppa it could again make a big contribution to SEN growth. The yield cannot be known of course but I never had the feeling that it was unsustainable under that branding.