A question:
In a given collaborative space a member's role can be changed from "Author" to "Reader", "Contributor", or to "Leader & Owner". In addition, the member can be deleted from this space. However, once the member's role is changed to "Leader & Owner", his / her role can't be "downgraded" to "Author", "Reader" or "Contributor" role and he/she can't be deleted from the collaborative space.
=> Is it an expected behavior or can it be considered as a bug?