Ah yes. I had spotted it but didn't change the screenshot of the updated figures!Incidentally, here seems to be a typo in your table for 2014. BRS-EDI carried 322,760 passengers that year, not the 233,760 shown. That will also affect the percentage change for 2014.
It certainly isn't unachievable. If BRS-EDI was up to x4-5 daily with Flybe still around then there's potential to win some passengers back as I'm sure there were many that avoided flybe and used BRS due to price, which Wizz could compete on.
A good starting point would be x11 weekly, with double daily Mon, Tues, Thurs and Fri.