Unfortunately Jet2 did used to be the airline that would take the risks, try new things and often be better off for it
In what way have they been innovative? (and don't say shopping trips to New York...)
The initial development at Leeds was significant, but elsewhere they seem to have had a conservative approach, both in terms of fleet and routes - trying what has worked for others. Also, remember that their expansion to NCL, BFS and EDI were underpinned by significant mail/freight contracts (the rumour at NCL when the combi's moved in was that they could fly around empty all day and still make money).
Don't get me wrong, this is a good thing - I like airlines that act sensibly, keeps people in work.