We still don't know where the By Myself sample is in Hit the Floor, if it is in the song to begin with. Even if it's unlikely, it's still possible that the sample loop is thrown in there and has nothing to do with the song. We can't know for sure until we can pinpoint its placement (or lack thereof).
Someone can correct me on this if I'm wrong, but Breaking the Habit doesn't really sample Points of Authority because I think that sample comes from a source outside of Linkin Park. If that's the case, that'd be like me saying Cure for the Itch samples Michael Jackson's HIStory because they both use the sample from Change the Beat.
There's not enough information to safely say any of those things except maybe that From the Inside samples One Step Closer. That one is pretty straightforward.