They have won many games 1-0, thats why they are at the top as they are capitalising on every opportunity they got. They are also only the team to score 5 goals for three times this season alone. Also they have the record of most number of clean sheet. This all doesnot come because of luck. If u singled out games agiinst bolton,blackburn etc than also think aginst Chelsea,Newcastle(5 goals). They will win EPL for sure,FA cup and UCL bit more competition.