What if there was a tighter Obstacle Race cut off?

Here's a hypothical that I've thought of recently. How would the UA Sports Festival and the future events of MHA change, if the cut off for the Obstacle Race was 20 instead of 42.

This means that the left over students are, in random order...
1. Ochaco Uraraka
2. Tsuyu Asui
3. Mezo Shoji
4. Koji Koda
5. Minoru Mineta
6. Juzo Honenuki
7. Tenya Ida
8. Yosetsu Awase
9. Katsuki Bakugo
10. Hanta Sero
11. Fumikage Tokoyami
12. Momo Yaoyorozu
13. Mina Ashido
14. Shoto Todoroki
15. Tetsutetsu Tetsutetsu
16. Izuku Midoriya
17. Mashirao Ojiro
18. Ibara Shiozaki
19. Eijiro Kirishima
20. Rikido Sato

I propose two ways the sports festival continues
a) Calvary battle still takes place. Remove who you may, then sort the remaining competitors into the order of the above list
b) Go straight to the tournament, with the charcters in the above brackets (e.g Ochaco vs Tsuyu, Mezo vs Koji)