As long as the old method still works. If anything goes wrong or there is something wrong leader to intervene if the work is not up to standard. Or there is something wrong.
As long as the old way still works If there is anything wrong or unusual thing occurred, leading to the intervention, if the others are not standard or there is something wrong.
As long as the old ways of working to be effective, if there is anything wrong or there is something wrong with the leaders will be to intervene if the function is not a standard or something went wrong.