> Even if he's 100% correct, what's he going to achieve? The changes aren't going into the kernel until they get past Linus

You are incorrectly assuming grsec guy wants the changes[1] in the mainline Linux kernel - this would destroy a huge fraction of the value proposition. In a follow-up message, Linus directly challenged them on how they intentionally make their patches hard to upstream (and how they complain about 'leeching' if someone does attempt to upstream - talk about lack of self-awareness).

1. He might not mind old changes, but the quicker the new patches get upstreamed, the less valuable the patchset becomes for their paying clients