#3 Balance out the Men's MITB match
Admittedly, this isn't the best reason in the world, but I think the Men's Money in the Bank match needs more balance to it. Three of the four current participants are baby faces, with King Corbin the only man there for the television audience to root against. Having Apollo in the match would outweigh the forces of evil 4-1.
This Friday on SmackDown Dolph Ziggler will battle Otis for the "final" spot in the MITB match. Otis has been on a roll as of late, including getting a big win over Ziggler at WrestleMania 36. There's a good chance he ends up getting the win again this Friday to punch his ticket to the biggest match of his career, which would further throw Corbin into a seas of good guys.
Now should Sonya Deville get involved on Friday, she could help Dolph get the win, but that would still not balance things. Adding Andrade not only adds a bit more credibility to the contest, but it also evens out the forces of good and evil at 3 a piece. That would please my O-C-D.