Originally Posted by
djerikd
...but it does mean they're offering upgrades into each and every F seat and not holding even back even one specifically reserved for sale.
Absolutely correct. That is, until IM changes it. I have often seen them change their minds after a seat sells or is allocated to award or upgraders (e.g. instead of going from F5 R0 X5 to F4 R0 X4 it can just go to F4 R0 X0 instead).