Did you guys have anything else planned with Jeff after this? Anything in the works?
And yeah, regarding demos like Turn To Grey and Ashes, or Xero versions of Carousel and Slip, maybe someone could find more promising leads, but for the time being it seems like only the band and Jeff have those demos. Jeff is not going to leak anything (I think he still works in the music industry so he has to toe the line, which is not something Dave Garrett or Andrew Lanoie had to worry about) but it seems like there isn't an issue with him inviting other people to listen to the tracks privately (confiscating phones, I was also in the Michael Jackson community and there's a lot of demos that got leaked because someone recorded them at seminars by former producers or collaborators).
For songs with Mark Wakefield's vocals (and maybe also songwriting), we need to consider that Mike already had to do some convincing to get Mark's ok for the ones we got on HT20.
Maaaaaybe we could get Ashes one day (Mike used to tell people Pictureboard wasn't worth it but after HT20 he was like "I never said it was a bad song", so who knows?), for Turn To Grey it's less likely if Mark is in the song, which is what it sounds like from this thread.