I'm not dissing you but his 5 defenders are more defensive. You have 3 defenders, and 2 defensive midfields wingers. What makes his flanks weaker is the fact your DML/DMR support the flanks making your flanks more offensive yes. So you had 4 wingers overlapping plus 1 St that's 5 Against 5. Although he had 1 ST but you forgot to protect you hole giving his AMC freedom to run at defense. His 2MC are more supportive of attacks than yours because you run into his DMC while his MC's have more space and support. So he has slight advantage thn you plus everyone knows the front attack is more devastating than wings thus the 1st lesson learned being a defender is to cover inside and push attackers out to he wing. not your fault or trying to be smart because I'm not Sir Alex nor a great manager. My dad was a pro back home I played all my life so I'm just expressing what I know. The person advised you with the formation favors wing play and has very good players to play in the wings giving him more success while you patch up a team, switching your strength making your players play in abnormal positions. Chill out Bro!