Milos is not & will never be a defensive winger. And he shouldn't be, since that would limit his stronger points.
However, each & every time he starts tracking back or following an opponent, he just stops after a while. God knows why, but he makes it impossible for his teammates to anticipate/cover/do something useful. Krasic alone could have cost us 2 or 3 goals last night. Some people may be ok with that, I am not.
He'll be average at best in that position. He's a wide midfielder. No one should be kidding themselves pretending he's a creative, almost second striker type. Even when his role began to change slightly in the 4-3-3 I thought he wasn't really playing to his strengths. We'll be getting the best out of a good player in a 4-4-2/4-4-3. Mazzarri would ruin Krasic and it would ruin our team.
True, Pepe looks best at RM (Roma, Fiorentina switching) as it's his natural position and he doesn't have to check back, he should be backup over there and a better LM, but we chanced with Martinez and Lanzafame
Pepe shouldn't even be playing football, but if he absolutely and necessarily has to bless pitches with his utter brand of shitball, he might as well be playing for FC Garbagio in Serie C2, or perhaps Trashcan United in the 4'th division in England.