I think you're wrong here. If we discuss the greatest of all time, let's say the top 5, they have to do it on every stage they took part in at some point in their career. Further down the list that criteria doesn't make sense. If someone has clearly a better club career it has to count for something. Messi wasn't more successful or influential in his club's trophy haul than Pele, Cruyff, Beckenbauer or di Stefano (arguably Maradona as well if we look at what he achieved with Napoli, though that's another discussion). So we have to bring in another dimension to compare them. It's about ability on the ball, leadership, influence on tactics, success for club and country. It can never be only about the worldcup.