That's where you are wrong, you clearly don't know what you're talking about because by them blocking people constantly, yes, their ranking WOULD be high enough.
The placement fights are pretty easy, so all they'd have to do is win those, and then they would instantly be in division 4 with only a few more fights until division 5. They could then start blocking whoever they wanted, get the W's, and proceed from there etc etc.
That's what you don't understand kid.
Division 4's can already face people in the top 100 and that right there also proves you're wrong and have no clue what you're talking about.
Coolin' N' Boolin' wit muh dawgs G homeboy, I'm out 4 sho yea.