As for the Brook vs Who's Who, that mask that makes Who's Who look like a devil to you is most likely broken now. The jiangshi is just your own speculation, and unlike Who's Who at least Black Maria actually has a yokai theme to her.
Ever since Oda setup Jinbe vs Who's Who and Robin and Brook vs Black Maria, you have been making up countless of excuses to have your fight predictions of Jinbe vs Jack and Brook vs Who's Who to come true.
As I said before, if Oda wanted Jinbe to fight Jack or Brook to fight Who's Who then he would have setup those matches already.
Between Jinbe vs Jack and Brook vs Who's Who, Jinbe vs Jack is the only one that I can maybe see happen but Brook vs Who's Who is not happening.
If for some reason Jinbe vs Jack and Brook vs Who's Who does happen, then I will admit I was wrong and also accept my L.