Each work item is 3-5 days of effort, performed by a person randomly selected from a pool.
The likelihood that any other work item will be performed by the same person will be small, presumably essentially zero. A high revisit probability would indicate the pool is rather small, negating the basic principles of Liquid.
Thus the developer staff will completely at least change once a week.
The
Mythical Man Month describes how communication costs can destroy projects. Fred Brooks was only concerned with consequences of adding new people, not wholesale replacement!