Amaranthe isn't the same without Henrik. I think they finally got their dream team in Elize, Henrik and Nils, and I think they knew that and knew they needed to do as much with it as possible before it's too late, hence why they made Manifest, which is arguably their best album. Helix was good, too, but really scatterbrained. Oh, and 'PvP' and the 'Army of the Night' cover were both great, too.
But it's just not the same :( Henrik was THE growler. GG6 himself. If Nils leaves, too, I'll be gutted.
Speaking of which, if you haven't heard 'From Sound to Silence' by Nils' band Dynazty, please do so. Henrik is featured on it.
It's funny, but I could almost swear they took a page out of k-pop's book when they worked on Manifest. The line distribution was perfection.