If you truly believe that Messi is lazy than you very misinformed or very young.
Messi was the most difficult player to cover because of his movement, pace and directness of his play, his run and his press made him the most dangerous player in the world at a very early age. Messi as he got older and started to get injured more. Because of his important to Argentina and Barcelona they changed his game/role to be more 'effective', run less, protect him and prevent injuries but lazy he was not. As for the 11 vs 11, it's quite ridiculous talk and pure fantasy. Messi is not a product of his environment he was just the smarter player to ever played football as well as the most complete. He will be remembered as such.
If we go with the Gretzky analogy, it would be like categorising Gretzky as lazy because he was not the most intense player, not the fastest and not the best stickhandler. He was just superior in reading the game just like Messi was in the later part of his career and widely considered the GOAT by all because of his superior talent just like Messi. If you are 5'7 and you can dominate and humiliate the modern day players which are vastly superior on athleticism, training and nutrition than what it used to be than you are very special.