The clash that has been going on here for some time is simply a fundamental disagreement in the definition of the concept Linkin Park. You guys are simply not talking about the same thing, so agreement can never be reached.
Subs talks about LP in a narrow sense——the LP with Chester. But Chester's voice is a trait of LP(perhaps a very iconic one), not LP itself. But the others who disagree define LP in a general sense.
Linkin Park as a band is dynamically changing and constantly evolving. In this whole course of evolution, there are definitely many traits in LP. And when we say something is not LP, it means that the LP now doesn't have the traits that used to be there. But we should define LP by the things they do, not only by the things they had formerly done, and definitely not what we think they should do.
What Subs means by saying LP without CB is not LP actually is that LP without CB is not the LP that it used to be, the classic LP that many of us love. Because Chester's vocals is a very iconic trait in LP's music, something we might have lost forever.
Just like when we say MTM is not LP, we mean that the LP style in the former two albums are mostly not present in MTM anymore. But MTM contains new LP traits, new music DNA, and these traits are still a part of LP.
And it's totally fine if anyone is highly emotionally attached to LP with a particular trait, but they should (and can) agree at the same time that even the most symbolic trait is not everything about LP. LP with a new vocalist is still LP in the general sense, simply with new traits.
PS: Sorry if my expressions sound a bit cryptic, I'm used to using formal and logical languange, but not the language online.