FR have been trying to get a decent presence in the east of Scotland for some time as it is a good inbound market and they would not want to give the whole market to EZY /Jet2. Expansion at EDI was always on the cards as FR wanted a presence on both sides of the country.
As regards PIK, what I think you will see is a consolidation of the present flights/destinations with little growth over the next year or so. There are bigger markets and profit to be made in mainland Europe. I cannot see FR moving from one side of the country to the other.