I see that Jet 2 have said that they have no interest in either the airline or the retail business of Thomas Cook.
And why should they? Jet2 are a 'new' agile company (16 years vs 150+ years) who have always preferred natural growth (same was said when Monarch went up for sale/ administration). They don't necessarily need anything that TC have, outside of certain hotels and airport slots, but even then, these would come with strings attached which would do more harm than good.
If Easy jet didn't revamp their Holidays offering, that would have been a much better pairing, as they already do a lot of business together; some Airbus commonality at similar airports and TC selling Easyjet seats for their packages.