You are making no sense. Are you asking about why you're not winning or why your best player/s isnt/arent performing?
As for the player, basically there are several factors which can change their output. IE, having a second striker able to male several assists usually ends in the other one scoring lots. Depends also on YOUR team Q and not also the opponents. A 7* striker in a 4-5* avg team will be the diamond's tip and most probably have the best score/assist/form. A 7* between other 10 7* is a paria, so you ll see your goals/ assists/ performances split over the team.