For Spurs, I think most of us expected to see them in that place along with Arsenal once they achieved the same number of games like the others. The remaining matches for ManU aren't all that easy, Leicester, Liverpool, Arsenal, Chelsea and even some of the others could let ManU in trouble.
Otherwise, until now the FA Cup games ended with the favourite teams winning. Liverpool is still 0-0 vs Nottingham at the end of the first half
Manchester United is going to go further down the point table this season because they haven't played like a team in this season at all. I have to say, they had some individual brilliance here and there. Other than that they haven't done anything to deserve the top four spots at all this season.
I think that Tottenham Hotspur is the more deserving team and they have earned their spot on the table. And trust me if Manchester United does not start winning consistently they will surely go further down the table.