Looking at the remaining fixtures for the top teams and looking at matches there is a reasonable chance they may lose.
I came up with following
Saints have 4 matches: Hull, Leeds, Warrington, and Huddersfield.
Leeds have 4 matches: Castleford, Warrington, Saints and Wigan
Wigan have 2 matches: Leeds and Warrington
Castleford have 3 matches: Leeds, Warrington, Catalan
Warrington have 5: Catalan Castleford, Huddersfield St.Helens and Wigan
So you can see looking at the above that Wigan have the easiest fixture list remaining, while Warrington have the toughest. Especially considering they also have a match against Leeds in the cup. If you include the cup Warrington have 6 tough fixtures in a row.
My prediction based on probability is therefore
Hubcap winners Wigan
2nd Castleford.
3rd Leeds due to superior goal difference to Saints and Saints have to go to Leeds.
4th St.Helens
5th Warrington
It will be interesting to see how things pan out however, as its perfectly possible for Saints to win all those tough fixtures and finish top. However in all likelihood we will lose some of them along with having a shocker against a team we should comfortably defeat.
Warrington are the team that everyone has to play and therefore have the destiny of the hubcap in their hands.