Dead Winter
STAHP
Tbh, that's not his biggest sin in my eyes. Between interviews with him and talking to former Nevermore members I've pieced it together. Jeff started out as a drummer before switching to guitar. He knows just enough to be dangerous. He writes the drum parts in tandem with the guitar parts. Some times its really obvious -- "Narcosynthesis" for example -- other times not so much. But he pretty much dictated the drum parts to Van.
I don't know any other band like this. Can you imagine Jeff or Kerry trying to tell Dave Lombardo what to play? The closest I can think of is Anthrax, where Charlie writes a lot of the music. Regardless, if Nevermore restarts with Jeff, and Van does not come back due to his wife's health issues, I hope the new drummer pushes back and tells Jeff, in so many words, you don't tell me how to play drums and I won't tell you how to play guitar.
I can totally see the Jeff and Van relationship in the studio and how it affects the songwriting. We're just spitballing here, but it definitely warrants speculation.