Everyone is entitled to their fair share of the airdrop. Let’s say I’m entitled to 10 tokens at 100 weeks. When the airdrop claim period starts I will only be able to claim 3 $XYZ in week 1. My balance that I can claim will slowly increase as time passes. During this time, I have the option to claim my current $XYZ balance and do whatever I want or I can wait for the full claim of 10 $XYZ in week 100 and potentially more XYZ because people will exit the airdrop game early..
Let's say I claim early and take my 3 $XYZ, the 7 $XYZ I forfeit gets divided up and pushed to those who have still not claimed the airdrop.