I like to view LP's music in separate era's. I can almost guarantee that when LP started work on MTM in early 2006 that they didn't consider using any old seeds or demos from old sessions like Meteora or Hybrid Theory or earlier. They basically started fresh and made tons of stuff. They ended up with like 150 songs. After they chose the 17 songs that would ultimately make MTM, they withered those 17 down to 12 songs. They then released MTM. After they completed touring for MTM, they started work on ATS in late 2008. I bet they used some old seeds and demos from the MTM sessions and worked on them, maybe some of those even making the album or making it far in the process. They then released ATS in fall 2010 and toured until late 2011, and they then started work on LT right away. We know they used some old ATS seeds and demos for LT (Primo, Tinfoil) both being examples. What I'm saying is, the band created TONS of stuff in 2006/2007 and they probably are still using some of that stuff today when working on new albums. I don't think they would ever use any old seeds/demos from prior to 2006. Debris was apparently a MTM demo, but we know it was in the Meeting of ATS, so that further proves my point.