Besides, it is not yet certain that BA will give up the IOM-LGW route so....................
The IOM-LGW, INV-LGW routes are included in the Bacon 'purchase' by FlyBe. As well as pilots, Enginneers and cabin staff, FlyBe get 7 prime slots at LGW probably worth £15 million.
BA in the form of Bacon are leaving IOM! If FlyBe do not make money on IOM LGW this year they will use the slots for a more profitable venture.
For any other operator similar slots at LGW to service IOM are not available and proabbaly as rare as LHR.