And by the way, why is Carlsen the current Gold Standard for chess genius? Carlsen is about 70 points higher than the next highest GM of this era... Fischer was about 120 pts higher than the next highest GM of his era. Fischer is the standard for a chess savant. He will be for a long time too. Fischer was in a whole different league from that little Norwegian Gremlin.
Simple reason is that Carlsen has built up on the styles of Fischer and Kasparov.
Kasparov calls his own style dynamic as aggressive as opposed to the more 'pure' and 'long-term' style of Carlsen. This is why Carlsen is the standard.
Also, Carlsen himself has said he has no preferences for any kind of positions. Having preferences means having weaknesses, he says.
You need raw talent on top of hard study. If you were ever Class D or below even as a kid starting out you'll never be a GM IMHO.
That's not enough a player needs strong nerves to take the pounding from highwire stress, shock, merciless pressure it's in a player or it just isn't there's no in between.