Interesting theory........many airlines will likely find themselves with too many aircraft this winter as demand for flights gets weaker over the winter period anyway. Even if Flybe are slowing expansion and they need to get rid of aircraft this is a far better solution compared to leaving them on the ground parked up.
I think its a classic example of good business sense, something which many airline managers seem to be missing. The thing you have to remember is this is only until Sept 10 and they will then return to the fleet so I reckon if it was a case of getting rid of aircraft because they dont want them they would put them up for sale.
To clarify a few things that are incorrect on this topic, the aircraft will operate in Flybe colours. This is the current intentions - nothing to say it will not change but at the moment it is definately Flybe colours with staff in BE uniform. Does not seem to bother Olympic so it is very much a case of extending the BE brand even if its not actually BE operated services.