About your point 1:

You are right except for two things:

1) 95% of the 300k+ that go in with a low power player just do it not to help the low power but simply to complete fast the 70 kills achievement and 90% of those low powers that go in with them are actually alts of themselves. So if you expect oasis to move an inch against somebodh that paid to win in a game that is p2w, sadly, you are dreaming. Even if you are perfectly right.

2) you are taking for granted to lose but is very possible that two 230ks are able to beat the 350k that go in with a 90k alt (same 460k total power) because is still a match between two op moves ninjas (move 1 and 2 of the 350k and the two move 1 of the two 230ks) and what may make the difference is the fact the two 230ks have 6 move 2-4 ninjas that are able to do something while the 90k is obliterated in 10 seconds simply by standard attacks. But if you expect to win with two 170ks indeed yes this won't happen.

About your point 2: the matching system is horrible but mostly is up on the fact too few people joins. Is like matsuri. Most of the unbalancements come out of the fact a lot of op players hit the 60 seconds queue time.

About your point 3: edo hirzuen hits 9 targets with mystery. Just make the field filled with clones or stack 30k shields and you solved most of the times the issue. After round 1 hiruzen is basically useless.