While people are bouncing ideas around, there is a possibility that BE will agree to sell a number of slots to EZY on the condition that they leave certain routes to Flybe. There is no confirmation of how many slots Flybe want to dispose of at LGW - the figure of 25 pairs is how many they currently have, not necessarily how many are for sale.
It would of course depend on whether Flybe see potential to make money on the route(s) in question and whether EZY are happy to give up one or two rather minor markets to secure a significant number of new slots.
I can just about see a deal where EZY leave the LGW-IOM (and maybe LGW-INV) route for example and Flybe continue it as they did/do. It would of course be at the expense of other LGW routes...
Pure speculation on my part. I honestly can't decide in my head what I think they will do.