There are always drops. Someone who got the drop may have already gotten the drop before, there fore, that drop is null. You're probably in a clan with very high percentages of chests owned. Other than that, destroyer has a natural low drop rate.
Linking an account to whatever ID doesn't count as a transfer. A transfer would be moving your account from one device (idevice or Android) to another one. This can be done by using your linked account ID.