But I think his whole, I dont care mantra is not what its portrayed. He still cares, and hes been very well prepared for each opponent, I think its more about how hes not being miserable with it anymore. More care free, than grinding. Its allowing him to play more relaxed and see more. Hes the least emotionally attached to any single tactic he begins that is possible. He has a strategy, but hes not invested in it so he allows himself to be brutally honest with every move. Hell abandon something the second its no longer the best course.
He also understands game theory as well as Carlsen does. He understands that his opponents get emotionally invested in tactics and he can use that against them.
Nakamura has always had weak openings, but he might have the second most powerful chess computer between his ears in the chess world to Carlsen. Carlsen is a freak of nature, when the chips are down hell make the most accurate moves. Id love to see this version of Hikaru vs Carlsen in world title mode. Id be really intrigued by the team Hikaru puts together too. If he could get Duda, Levin, and Fabiano in his corner hed come up with something fun for Carlsen to deal with.