Anand and Carlsen said Fischer was the GOAT with Kasparov rank 2.
"When interviewed in 2008 shortly after Fischer's death, he [Anand] ranked Fischer and Kasparov as the greatest, with Kasparov a little ahead"
"In 2012, Magnus Carlsen said that Kasparov is the greatest player of all time"
"Levon Aronian stated that he considers Garry Kasparov the greatest player of all time"
"The other world champions had something 'missing'. I [Kramnik] can't say the same about Kasparov: he can do everything."
"In his 2008 obituary of Bobby Fischer, Leonard Barden wrote that most experts ranked Kasparov as the greatest ever"
https://en.wikipedia.org/wiki/Comparison_of_top_chess_players_throughout_history
"Bobby Fischer was the greatest chess player who ever lived. He was a very special person, and I was fortunate to meet him two years ago... He passed away recently, now I consider that I was lucky to meet him". Anand (The telegraph, Calcutta, 2009)
https://www.youtube.com/watch?v=Q6g77y_4OQs - Carlsen said in terms of peak/dominance and overall rank Fischer > Kasparov. So, clearly in terms of pure ability he is better even without anyone helping him unlike Kasparov.
The precision and energy that he played with is just unmatched in the history of chess. So Bobby Fischer from 1970 to 1972." - On his dream rival Carlsen CNN 2015
Kasparov wins in longevity that's it. But that would make Lasker the GOAT.
Anand and Carlsen said Fischer was the GOAT with Kasparov rank 2.
"When interviewed in 2008 shortly after Fischer's death, he [Anand] ranked Fischer and Kasparov as the greatest, with Kasparov a little ahead"
"In 2012, Magnus Carlsen said that Kasparov is the greatest player of all time"
"Levon Aronian stated that he considers Garry Kasparov the greatest player of all time"
"The other world champions had something 'missing'. I [Kramnik] can't say the same about Kasparov: he can do everything."
"In his 2008 obituary of Bobby Fischer, Leonard Barden wrote that most experts ranked Kasparov as the greatest ever"
https://en.wikipedia.org/wiki/Comparison_of_top_chess_players_throughout_history