Here my story,year ago i was 87k when lucky stars come with 80 frags of event ninjas.Then some guy who was 60k get 2 jackpots back to back for 2 months.And being near 30k below me,start kicking my ass daily.Power didnt help me at all,with my Roshi and kage rares.So for me,better strategy is to get some event ninjas,then work on power.