433 havent conceded in 15 matches. For best teams (playing as Manchester UTD)

i was playing with default 433 gengenpress with some tweaks for while then i somehow decided to try out the mezzalla role in the cm. i noticed that player was driving forward more so i decided to make the other cm also a mezzalla then after few matches it occured to me i havent conceded. to my surprise i got a notification that i have set record for most number of matches not conceded (15) then started paying more attention to the tactic. screenshots of details below. mind you i was using 5 star players in every position in my machester save.