He only lost once?!
FIDE World Blitz Chess Championship

Nakamura is also over 2900. Yeah he only lost once, the only annoying thing is that i can't find a final standings on the official site, it only shows it up until round 20.

All complete final standings with tiebreaks.
http://chess-results.com/tnr138146.aspx?lan=0&art=1&rd=21&flag=30&wi=821
Carlsen scored +13 in 21 rounds in the toughest blitz World Championship ever, quite impressive considering that a strong blitz player like Karjakin didn't reach a plus score and finished 61st.

Karjakin lost well over 100 rating points between this and Norway chess.....A rather disapointing drop from #2 to #24.

Aronian is Carlsen's best friend! To start with he didn't beat Carlsen when he had a maybe not winning but definately much better position. And secondly he went and beat Carlsens closest opponent Ian the Russian (don't ask me to spell his last name!).

You can really see there is no love lost between Carlsen and Nakamura. Carlsen shook Nepo's hand after his last game, but just walked by Nakamura. Also, during the post tournament press conference, Carlsen mentioned some of his "tough cometition" but never mentioned Nakamura. And then there was Naka's comment a few months ago. (Don't remember the exact quote so I won't post, maybe someone else can find it.)

WalkontheWildSide, yeah, but Nepo (thanks MSC!!) is one of magnus's good friends, as is (i think) Levon Aronian. These players usually are friendly with one another with a few exceptions (Naka-Carlsen with some tension or Kramnik-Topalov)

He started higher than others too. However, those rating changes are quite hilarious.
Since the blitz and live ratings are very recent, they are not yet stabilised. When they will have play a few dozens games, the K-factor will be reduced (or at least it should. With FIDE you can never know.)
Ok, he and Mamedyarov drew. Nemo96, please quit being a troll.