With squad numbers in Serie A in particular due to squad sizes players are numbered 1 to like 200 with first team members getting numbers 1-99 .. it has nothing to do with diva behaviours its just the nature of the league if you are assigned a number in academy it only can change if you request it and number becomes available but most times players become attached to that number so decide not to change it to a traditional 1-30 squad number.. if you are going to make outlandish statements at least do some research first