Stats reset.  In fact, TWO of them and he's still playing.  How?  Plus there is that 85% headshots as he went 75:1 his most recent battlereport using just vehicles, along with much more not to like.

Stats resets: http://prntscr.com/gl1joj

HS: http://battlelog.battlefield.com/bf4/battlereport/show/1/903966982174936704/1734593854/