The whole story of Enzo is simple.
Enzo annoyed Kurt to the point where Angle actually approved a sheet saying you can't get another shot at the title if you attack him, Neville attacked him anyway and proudly announced how he didn't care about that and happily beat his ass anyway. Then the rest of the Cruisers attacked and beat him up, so Kurt Angle added Kalisto to the division as someone who hasn't violated the don't touch Enzo rule.
It's pretty simple, easy to follow, develops characters, makes sense, got a lot of people more over, it's the type of stuff Raw should be doing in general but almost always doesn't.
So now they're like "okay so in the main event we want Enzo to beat Neville (I assume in the same way he did at the last PPV)" which totally slaps all that in the face.