Yeah, United is making a comeback and will be strong contenders in the 2nd half, but the league is more predictable than the NBA. I think only 8 teams have won the last 35 titles. The Premier League is probably 6 teams since it started.
Southhampton play great defense, but they do not have the offense to contend. They are Top 6, not Top 3. Liverpool will always be dangerous as long as Suarez and Sturridge get along. Tottenham should fall a bit more, they just aren't contenders. Chelsea, City, Arsenal and United are still the Top 4 teams despite what the standings say. Only difference is Arsenal put it together while United slipped a bit.