There's actually no thread, just people in a conversation, so removing some people creates a new conversation with the remainder, with the "q" tag just leading back to the last point. If you want to address the full group again, you just go back to that point and don't remove anyone from the "p" tags, in your "reply".
btw nostr:npub1m4ny6hjqzepn4rxknuq94c2gpqzr29ufkkw7ttcxyak7v43n6vvsajc2jl you could just remove the "root" e tag and have the same effect of detaching the line of the conversation from the tree, with a smaller event size
then you render the "e","
Discussion
i'm just trying to suggest a way that reduces the size of the events and while still increasing the complexity of constructing the tree