Ronaldo went to Milan 95 kilograms and was still scoring goals very few players could. That is talent extraordinaire. If Messi/Ronaldo or almost all players are out of their shape by such a huge margin they wouldn't be able to compete, let alone still score amazing goals. I am not glorifying R9, he just is. Saying he isn't is just as pathetic as being an Inter fan calling Buffon a grandpa, who is past it since 2010. BTW, Buffon shares my opinion regarding R9, but I guess he is in error too.
"Football will be fine without" ... any player you can mention. Life would be fine without both of us and this conversation, yet we are talking about it. Such generalizations bring very little to the table imho.
Barca and RM with their 'best ever players', accompanied by the other great players of the day. Was this your question?