Problem is, there isn't a Jet 2 Pilot vacancy position that asks for this
Harsh but...I think you've answered your own question! 129 pilots recruited with a business model that is very seasonal at the moment; I would hazard a guess that people who can arrive and be on the line in the minimum 10-20 sectors for when the next new recruits arrive is probably part of the plan!
I feel I should say a few words for those hard working folk in the rostering/planning office...