Exactly. These are the same as the discussions about who is the GOAT in the basketball world. In chess we have an advantage in that we can analyze with computers, but invariably there is always some different variable that mixes up the order depending on how you program the analysis or what algorithms you use. But invariably you get some mix of Fischer, Kasparov, Karpov, Capablanca, Botvinnik, Alekhine, Lasker, and a few others, and then Carlsen gets thrown in the mix as well. It is an argument that will likely never be settled. For me the top 3 of all time, in order, are Fischer, Kasparov and Capablanca. Top 5 would include Carlsen and Karpov. Of course, as always, imho.