I remember seeing some footage of when LP was recording THP, Chester jokingly said something along the lines of "All I do is sleep and they wake me up when they need me to sing". It makes me believe that he wasn't able to fully contribute to the writing process as much as he usually does since he was doing a lot of extensive touring with STP at that time.
Maybe this time around, Chester wants to contribute more to LP7 then he did to THP. I don't really see why there needs to be so much argument about it lol.