I CC'd myself on an Update Request to UserX. I used the link in the email copy I received to update the task because UserX informed me of his updates via email. After I made the updates using the link in the Update Request email, the cell history in the smartsheet shows that the updates were made by UserX instead of me. 
Is this expected behavior? If this is expected behavior, I would like to request that the name of the user who made the change be listed in the cell history. If the person using the link is not a named user in smartsheet, then some other designation should be used in the cell history (e.g. unknown) or the update attempt should fail.