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easyJet are not well known for being forthcoming on EC261, Ryanair are better, strangely. But this is a good example of where you would need to construct the case carefully. ATC is indeed a legitimate extraordinary circumstances defence, but easyJet are also responsible for minimising this and also for the outcomes. So if easyJet could have arranged their crew rotas to avoid this, or there was more they could reasonaby have done to reduce the delay, then they may well be liable. It's not the sort of thing where a quick form filling into to MCOL or CEDR will work, you need to assemble the details and arguments carefully for MCOL. For CEDR you don't have to do this so much, but the argument - and all details - will have to be carefully formulated.