Following advice from @Undisciplined, I need to clarify a couple of points:

1. Regarding "If you miss to provide a team, it will be considered as if your team had lost." In addition :

    + I will randomly assign a team that won in the week you miss to provide it.

2. Regarding "If the team loses, the stacker is eliminated unless uses the second buy-in." I need to clarify that:

   + In the event of a draw in the first leg's matches of round of 16, 
      QF or SF, stackers will not be eliminated.