which role, group, or person is the most essential for the Feudal Structure to work and function properly?

Vassals had certain duties to perform. Their most important duty was to help the lord in battle. Vassals had to bring their own knights with them.

Explanation:

1) the andrew carniage's purchase and renovation of skibo castle have been very good and auspicious for the local people of dornoch firth, scotland because this is a turistic attraction for many people who would want to know the castle, the local people would take advantage about this.

2) yes, it could.

explanation:

damn girl thats not really your friend then. : /