And heres why they improved
However, updates to the front and side architecture (including the engine compartment, side body structure, and front suspension components) of the 2015 Encore significantly improved its performance in the test. The blue test vehicle shows a substantial improvement in the driver’s survival space, and the steering column and dashboard intrude far less into the cabin, helping improve the airbag’s effectiveness. Additionally, the side-curtain airbag deployed sooner, further improving safety. The new Encore received the IIHS's highest rating of "good" for the small overlap test.