People who aren't drafting are still using up a spot (barring them actually unjoining the leauge).
If you can't draft, you can/could always set your top rankings/preferences prior, too.
I am sorry for peeps who tried to get in to late, but were top quality desired participants; I would just expand league, however if an odd number were to join, the entire league goes kaput.
And the people who won't be drafting didn't unjoin, and may well still want to manage their teams throughout the season.
See yall in it @ 930!