We're in shared space, setting out and taking up mats is SOP. Typically, if the class is that small, we either set out fewer mats, or do jo kata.
I guess I'm kinda puzzled by your other questions, Brad. Your instructor, or whomever happens to be teaching has no more obligation to teach you than you have to dragging your butt to class, IMO.
If you're the only one besides the instructor, you are just as necessary as she (he) is, if practice is going to happen.
I'm not seeing how this feeds into compromised integrity, though. Were you refused the chance to practice?
Let me know, I'm curious,