He is just using another account to push his stats.

The account I__JAN1CE__I is in all of his sussy rounds.

Editing Posts seems to be broken. However..

"Ihr" wart nur einmal zusammen in der selben Runde und das war auf einen leeren Server. Was für mich aber eher danach aussieht als wenn du erst mit 

Bunyip_117 und dann später mit KontaktinKontakt draufgejoined bist und du zwischendurch nur die Accounts gewechselt hast.

https://battlelog.battlefield.com/bf4/battlereport/show/1/1842354378085707392/241463914/

Und nurmal so, über https://bf4cheatreport.com/ kann man die Uhrzeit und das Datum der Runden sehen. Ansonsten sehe ich hier keine Zeiten wo ihr beide gleichzeitig am spielen wart.

Ihr habt aber nie zeitgleich gespielt so wie es aussieht.

You mean the high Score per Minute? Thats because he joined right before the Round ends. He was ingame for around 15 Seconds got a kill and the points for being in the winning team. The points are calculated up to atleast one minute.

How to report someone on BF4DB:

1. Search for the Account you want to report by using the Searchbar in the right upper corner
2. Click on his Profile
3. Click on Report 
4. Fill out the form and proof it with some good evidence (longer videos would be better)
5. Activate Windows
6. Wait for Moderator/Admins to act.

Next time use the search bar to search for his account and use the report button on his profile. The Forum here isnt for reports anymore.

Your Presentation cant be changed here, you have to change it in Battlelog.

https://battlelog.battlefield.com/bf4/profile/edit/edit-profile/

maybe that answers your question