It will be a shame if he has indeed left the club permanently, but Klopp and the club will be able to cope without him.
we'll see. He's had a massive influence. And yes, Klopp does tend to go big on the praise for the work and influence of those he works with, cos that is how he is - happy to not take credit when he can give it to others. But these two together, wow, that's 17 years worth of intense work and preperations and 25 years of friendship and being collegeagues. That's a lot to lose. I'm more sad for Kloppo than anyone mind.
We'll see what happens, best to go with the glass half full stance though, and see if new influences can add something new.