Yes - I can't justify my instinct here. I believe there have only ever been 7 players >2800 ELO and Caruana is one of them. But of those Kasparov is retired and

Yes - I can't justify my instinct here. I believe there have only ever been 7 players >2800 ELO and Caruana is one of them. But of those Kasparov is retired and Anand, Topalov and probably Kramnik have probably peaked. That leaves Carlsen - out on his own - and Aronian and Caruana. Aronian has probably peaked (he is 31)which leaves Caruana. The next 2-3 years should tell us what he is capable of.