Answered: Alliance selection team shortage

There were 24 teams at a recent event I attended. The format for the elimination round was eight alliances of three. During alliance selection, one of the teams (which was not an alliance captain) declined an invitation, leaving only 23 teams eligible to play in the elimination round. Thus, the eighth alliance did not have anyone to select for their last pick. I looked through section 3 (The Tournament) of the game manual, but I was unsure of how to continue. How should have the event proceeded in this scenario?

The 8th alliance would proceed with an alliance of two teams, and be granted an allowance to play both teams in all matches.