Heroic had 50/50 games with Navi even with Boombl4 and even before Boombl4. Even when Heroic had blameF. With Boombl4, everyone was on insane form and even s1mple was in form of his life, he used to save them so much. But now Heroic has gotten stronger and on other hand Navi has gotten worse and players have lost their forms specially s1mple. I do not think boombl4 would have fixed that either. Vitality is still a pretty good team for Navi, they have beaten them alot, especially even without boombl4. G2 is the only team which has turned their luck since boombl4 left, with boombl4 Navi used to smash G2, but now they get smashed by G2 pretty easily. S1mple seems nervous, he usually plays bad when he plays vs his rivals such as coldzera, NiKo, ZywOo and now m0nesy- Hence Navi loses to G2 pretty easily. But can be other reasons aswell.