The winner itself isn't always so hard and can often be obvious, but you know Mania plans are on the line, so each match has influence over other matches.

Maybe there are 2-3 rumble winner favorites, but who wins is depending on who wins the title match so now you gotta get that right too. Then there are so many ways to make people look good while not winning.

It's just a domino effect where you usually get it all right or all wrong. It's hard to get some of it outside of the random bonus guessing.