As one of the captains affected it seemed that pilots were simply chopped from bases where there were aircraft reductions, so a pilot from the 'wrong' base would go irrespective of his/her time served. Hence some line trainers went from the more affected bases along with new joiners at others.
An FO who I joined with last year thankfully still has his job. He was working in a different country and the axe didn't fall on his area. I don't think that performance played much of a part of the selection even though it's mentioned in the redundancy criteria. Wrong place and you were out on a last in/first out basis from what I can make of it. Purely academic however, the whole situation sucks. Particularly disappointing from a company thats as cash rich as Wizz Is.