Yes I look at the paws.
If you look at cats like Filou or Nakita or Juni, they will ever be small and it would be a pity if they were too big. If you look at Tigris and Gabe and Edwina, they are quite bigger but still ok. So, if Rocky is of the Tigris type, he may well have the size of an adukt Aby and still be ok.
Anyway it is easier to prevent little cats from getting too big than to cut the diet on older ones which are more prone to health problems if they're too fat.