Those people need to start ranking up then. They may have registered late which is why you had to fight them. CSB goes by rank/points from what I've seen. Just keep getting stronger like everyone else says. You asking for people to only use mains won't be much use at the higher levels anyways, most have T1 and will kill you either way.
my main problem is i can defeat 10-13 from the 18 ones in the pyramid the problem is the arrangement of them sometimes i get super weak one at the top and super strong one is 1st row . if they put them in an order from lower bp to higher this will be fair and no one will complain.