https://bf4db.com/player/643640866

https://battlelog.battlefield.com/bf4/battlereport/show/1/1260263365865946560/643640866/  (AWS 119 kill | 53 HS ) ~ 50% Normal ?

https://battlelog.battlefield.com/bf4/battlereport/show/1/1259282693566487232/643640866/  (ACW-R 100 KILL | 50 HS )  ~ 50% Normal ?

https://battlelog.battlefield.com/bf4/battlereport/show/1/1259983193203850688/643640866/ (AWS 163 kill | 55 HS  ) ~ 50% Normal ?

Headshot almost 50% efficiency? 

I didn't even see competitive players!

All those rounds have a significant amount of sniper/dmr kills (check the ribbons). It's not that player isn't suspicious, but it will be settled faster with a video record.