Have you seen this, which expands on how to organise content?
Groups & channel settings
You create a group, create channels, add videos etc. and the content belongs to the group and you can add multiple owners to manage the group accordingly.
This means it doesn't matter who created the group first and what happens to their account, as you can have multiple owners who can step in and manage the group, the same as you can.
Does that make it any clearer?