Shit, this is actually a huge loss. If he left to focus on IKTPQ then that was a waste. I like them but BMTH is leagues above them and have much more potential for global success.
He didn't apparently "multipul arguments with Oli Sykes" caused him to leave? Must have been serious considering he spent the whole year recording with them to make the new album only to leave a few month before its release. Will this impact the band? I'd say greatly Jonas was a really dope guitarist and he's gonna be hard to beat.