Okay so let me get this straight. These were 5's contestants (the ? means I'm not sure):
Jann, Hitomi, Lei Fang, Eliot, Brad?, Mila, Kokoro, Tina?, and Bass?.
The non-participants: There are 4 VFs , Alpha, Gen Fu who was just hiding out in China during all of this, Lisa+Christie+Rig who work for MIST, Bayman who's trying to find P4, Helena and Zack who are running the tournament, all 4 main ninjas were out, Momiji+Rachel+Ein+Leon weren't added til 5U so they missed the tournament and 5UA add-ons MR and P4.
Even if you include the questionable participants that's only 9 fighters out of 31.
That's pretty crazy if you think about it for a game originally based on the dead or alive tournament.