I honestly don't think Southampton are much of a threat.
Although they are currently unbeaten for the last 9 games, the only team they have faced over this period that are currently in the top half of the table is Watford. Over the last 5 games they haven't played anyone higher that 17th at present.
If you look at their results as a whole, the vast majority of their wins have been against teams in the bottom half of the table which accounts for 11 out of their 14 wins, meaning that, of the 16 games they have played against top half oppositions, they have only won 3.
They are even worse the higher up the table you go with them having yet to beat a team in the current top 5 this season. The only time they have won a game this season against any team in the current top 6 was against Wrexham on the opening day of the season.
They also look more vulnerable on the road too with them having dropped points against Pompey and West Brom away in their current unbeaten run.
Plus, we owe them one for saying mean things about Super-Frank at their place and getting us fined.