They'll probably take on some salary from one of the teams over shedding or NYR who want to dump Trouba.
Though I don't think they technically have to. ELC bonuses counts on the AAV and can count on the cap. The real quirk is that teams are allowed to exceed the cap via bonuses then roll it over to a future year. They need to 'spend' 6.6m more but have 8.25m in potential bonuses. I believe they are allowed to count that in this season even if the bonuses are not met to reach the floor.
Yeah that makes sense. Been a couple years since we've had bonuses to really think about so I had forgotten about them.