Most organizations will not rank another organization's champion. A lot of times they won't rank somebody ranked by another organization in their top 10.
You pay for rankings. It is a status and a money game.
The WBo is very obvious about this, but that is how it plays out across the board. It works like this if your financial backing isn't strong: Your management or promotional team will play up front to get you ranked. If you are successful, down the road your training expenses, for which you are compensated, will be 20,000, but your manager/promoter will say that they were 35,000, and that will be deducted from what the fighter gets. That is repayment on what was spent to get him favorable rankings.
You can fight your way up but...you and I have been around long enough to know the fighter I was with in 2015. When his manager got a deal worked out with money people, part of which involved moving that fighter to being trained by Abel Sanchez, he immediately went from #14 in the organizations to #7. Without a fight.
My partner has told me stories of his time with a guy that became a WBO world champion. The guy was getting paid $150,000 for a fight, but getting 30 because of "training expenses" that were payments to keep him ranked and moving up.
And this goes back to why guys never get matched tough coming up...you find a guy that you can market and the investment starts piling up from the gate.