>>536570717
There's a billion entrants, and to get past a round you need to luckshit into facing people around your levels 3 out of 5 races. But you have 8 chances each round, which is a lot.

It works out that it really isn't that hard to make it past each filter, even with sub-par umas. If there were more rounds then it would be a harder check, but as it stands with only two rounds the pool doesn't get whittled down much.