AFAIK, Wizz Air has some kind of discounts for "not basing an aicrafts" and flying on peaks. Not sure how this discount scheme works in practice. As LTN is busiest airport for Wizz Air at their network, they are motivated not to base aircrafts at LTN but to fly-in. Flying-in usually is on different schedules then FR and EZY which are based.
You can see that in practice, FR and EZY all based aicrafts leave on 06:00-07:30 in the morning, then Wizz lands at 07:30 and leaves about 08:00-08:30.