merge source with update
Servicing mode of Any package or application that are created like
O365 Client to be patched or update thru an Software update that will modified the content (slipstream) with the latest version .
like this we can use into an TS or any new Advertisement with the correct source uptodate.
And spare bandwith and deployment time for be ready on User side (not creating an initial deployment that will be patched after by and Software update one) to achive the result of end user side to have the latest one.